diff --git a/INSTALL.md b/INSTALL.md
index 1c2cecf8ef9b3..ded0b59fc6cd3 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -215,7 +215,7 @@ python x.py build
 
 Right now, building Rust only works with some known versions of Visual Studio.
 If you have a more recent version installed and the build system doesn't
-understand, you may need to force rustbuild to use an older version.
+understand, you may need to force bootstrap to use an older version.
 This can be done by manually calling the appropriate vcvars file before running
 the bootstrap.
 
diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index 2bd5dfdce83ee..dd134ebbe6b18 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -398,7 +398,7 @@ impl<'a> GccLinker<'a> {
             self.link_arg("-dylib");
 
             // Note that the `osx_rpath_install_name` option here is a hack
-            // purely to support rustbuild right now, we should get a more
+            // purely to support bootstrap right now, we should get a more
             // principled solution at some point to force the compiler to pass
             // the right `-Wl,-install_name` with an `@rpath` in it.
             if self.sess.opts.cg.rpath || self.sess.opts.unstable_opts.osx_rpath_install_name {
diff --git a/compiler/rustc_parse/src/parser/attr_wrapper.rs b/compiler/rustc_parse/src/parser/attr_wrapper.rs
index 38f18022e3c58..e9aece13b2e68 100644
--- a/compiler/rustc_parse/src/parser/attr_wrapper.rs
+++ b/compiler/rustc_parse/src/parser/attr_wrapper.rs
@@ -352,15 +352,10 @@ impl<'a> Parser<'a> {
             let target = AttrsTarget { attrs: final_attrs.iter().cloned().collect(), tokens };
             self.capture_state.replace_ranges.push((start_pos..end_pos, Some(target)));
             self.capture_state.replace_ranges.extend(inner_attr_replace_ranges);
-        }
-
-        // Only clear our `replace_ranges` when we're finished capturing entirely.
-        if matches!(self.capture_state.capturing, Capturing::No) {
+        } else if matches!(self.capture_state.capturing, Capturing::No) {
+            // Only clear the ranges once we've finished capturing entirely.
             self.capture_state.replace_ranges.clear();
-            // We don't clear `inner_attr_ranges`, as doing so repeatedly
-            // had a measurable performance impact. Most inner attributes that
-            // we insert will get removed - when we drop the parser, we'll free
-            // up the memory used by any attributes that we didn't remove from the map.
+            self.capture_state.inner_attr_ranges.clear();
         }
         Ok(ret)
     }
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 41c99f7edeeff..e748d1ff47b63 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -2620,7 +2620,7 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         // This is the location used by the `rust-src` `rustup` component.
         let mut candidate = sysroot.join("lib/rustlib/src/rust");
         if let Ok(metadata) = candidate.symlink_metadata() {
-            // Replace the symlink rustbuild creates, with its destination.
+            // Replace the symlink bootstrap creates, with its destination.
             // We could try to use `fs::canonicalize` instead, but that might
             // produce unnecessarily verbose path.
             if metadata.file_type().is_symlink() {
diff --git a/config.example.toml b/config.example.toml
index 679abcdc7771b..68c632d91cdec 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -1,6 +1,6 @@
 # Sample TOML configuration file for building Rust.
 #
-# To configure rustbuild, run `./configure` or `./x.py setup`.
+# To configure bootstrap, run `./configure` or `./x.py setup`.
 # See https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html#create-a-configtoml for more information.
 #
 # All options are commented out by default in this file, and they're commented
@@ -109,7 +109,7 @@
 # increases the size of binaries and consequently the memory required by
 # each linker process.
 # If set to 0, linker invocations are treated like any other job and
-# controlled by rustbuild's -j parameter.
+# controlled by bootstrap's -j parameter.
 #link-jobs = 0
 
 # Whether to build LLVM as a dynamically linked library (as opposed to statically linked).
@@ -371,11 +371,11 @@
 # Useful for modifying only the stage2 compiler without having to pass `--keep-stage 0` each time.
 #local-rebuild = false
 
-# Print out how long each rustbuild step took (mostly intended for CI and
+# Print out how long each bootstrap step took (mostly intended for CI and
 # tracking over time)
 #print-step-timings = false
 
-# Print out resource usage data for each rustbuild step, as defined by the Unix
+# Print out resource usage data for each bootstrap step, as defined by the Unix
 # struct rusage. (Note that this setting is completely unstable: the data it
 # captures, what platforms it supports, the format of its associated output, and
 # this setting's very existence, are all subject to change.)
diff --git a/library/std/src/io/buffered/bufwriter.rs b/library/std/src/io/buffered/bufwriter.rs
index 2d13230ffbabd..1768bb05ddbcb 100644
--- a/library/std/src/io/buffered/bufwriter.rs
+++ b/library/std/src/io/buffered/bufwriter.rs
@@ -3,7 +3,7 @@ use crate::fmt;
 use crate::io::{
     self, ErrorKind, IntoInnerError, IoSlice, Seek, SeekFrom, Write, DEFAULT_BUF_SIZE,
 };
-use crate::mem;
+use crate::mem::{self, ManuallyDrop};
 use crate::ptr;
 
 /// Wraps a writer and buffers its output.
@@ -164,13 +164,13 @@ impl<W: Write> BufWriter<W> {
     /// assert_eq!(&buffered_data.unwrap(), b"ata");
     /// ```
     #[stable(feature = "bufwriter_into_parts", since = "1.56.0")]
-    pub fn into_parts(mut self) -> (W, Result<Vec<u8>, WriterPanicked>) {
-        let buf = mem::take(&mut self.buf);
-        let buf = if !self.panicked { Ok(buf) } else { Err(WriterPanicked { buf }) };
+    pub fn into_parts(self) -> (W, Result<Vec<u8>, WriterPanicked>) {
+        let mut this = ManuallyDrop::new(self);
+        let buf = mem::take(&mut this.buf);
+        let buf = if !this.panicked { Ok(buf) } else { Err(WriterPanicked { buf }) };
 
-        // SAFETY: forget(self) prevents double dropping inner
-        let inner = unsafe { ptr::read(&self.inner) };
-        mem::forget(self);
+        // SAFETY: double-drops are prevented by putting `this` in a ManuallyDrop that is never dropped
+        let inner = unsafe { ptr::read(&this.inner) };
 
         (inner, buf)
     }
diff --git a/library/std/src/io/buffered/tests.rs b/library/std/src/io/buffered/tests.rs
index ee0db30e22c2e..ab66deaf31d22 100644
--- a/library/std/src/io/buffered/tests.rs
+++ b/library/std/src/io/buffered/tests.rs
@@ -1067,3 +1067,13 @@ fn bufreader_full_initialize() {
     // But we initialized the whole buffer!
     assert_eq!(reader.initialized(), reader.capacity());
 }
+
+/// This is a regression test for https://github.com/rust-lang/rust/issues/127584.
+#[test]
+fn bufwriter_aliasing() {
+    use crate::io::{BufWriter, Cursor};
+    let mut v = vec![0; 1024];
+    let c = Cursor::new(&mut v);
+    let w = BufWriter::new(Box::new(c));
+    let _ = w.into_parts();
+}
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 66aeb35aceec0..d13e38889e1d5 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -684,6 +684,9 @@ pub use core::{
     module_path, option_env, stringify, trace_macros,
 };
 
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+pub use crate::sys::anonymous_pipe as pipe;
+
 #[unstable(
     feature = "concat_bytes",
     issue = "87555",
diff --git a/library/std/src/sys/anonymous_pipe/mod.rs b/library/std/src/sys/anonymous_pipe/mod.rs
new file mode 100644
index 0000000000000..07c5f74aec414
--- /dev/null
+++ b/library/std/src/sys/anonymous_pipe/mod.rs
@@ -0,0 +1,141 @@
+//! Module for annoymous pipe
+//!
+//! ```
+//! #![feature(anonymous_pipe)]
+//! # fn main() -> std::io::Result<()> {
+//! let (reader, writer) = std::pipe::pipe()?;
+//! # Ok(())
+//! # }
+//! ```
+
+use crate::{io, sys::pipe::AnonPipe};
+
+/// Create annoymous pipe that is close-on-exec and blocking.
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+#[inline]
+pub fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
+    cfg_if::cfg_if! {
+        if #[cfg(unix)] {
+            unix::pipe()
+        } else if #[cfg(windows)] {
+            windows::pipe()
+        } else {
+            Err(io::Error::UNSUPPORTED_PLATFORM)
+        }
+    }
+}
+
+/// Read end of the annoymous pipe.
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+#[derive(Debug)]
+pub struct PipeReader(AnonPipe);
+
+/// Write end of the annoymous pipe.
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+#[derive(Debug)]
+pub struct PipeWriter(AnonPipe);
+
+impl PipeReader {
+    /// Create a new [`PipeReader`] instance that shares the same underlying file description.
+    #[unstable(feature = "anonymous_pipe", issue = "127154")]
+    pub fn try_clone(&self) -> io::Result<Self> {
+        self.0.try_clone().map(Self)
+    }
+}
+
+impl PipeWriter {
+    /// Create a new [`PipeWriter`] instance that shares the same underlying file description.
+    #[unstable(feature = "anonymous_pipe", issue = "127154")]
+    pub fn try_clone(&self) -> io::Result<Self> {
+        self.0.try_clone().map(Self)
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl io::Read for &PipeReader {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+    fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
+        self.0.read_vectored(bufs)
+    }
+    #[inline]
+    fn is_read_vectored(&self) -> bool {
+        self.0.is_read_vectored()
+    }
+    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.0.read_to_end(buf)
+    }
+    fn read_buf(&mut self, buf: io::BorrowedCursor<'_>) -> io::Result<()> {
+        self.0.read_buf(buf)
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl io::Read for PipeReader {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+    fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
+        self.0.read_vectored(bufs)
+    }
+    #[inline]
+    fn is_read_vectored(&self) -> bool {
+        self.0.is_read_vectored()
+    }
+    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.0.read_to_end(buf)
+    }
+    fn read_buf(&mut self, buf: io::BorrowedCursor<'_>) -> io::Result<()> {
+        self.0.read_buf(buf)
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl io::Write for &PipeWriter {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.0.write(buf)
+    }
+    #[inline]
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+        self.0.write_vectored(bufs)
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        self.0.is_write_vectored()
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl io::Write for PipeWriter {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.0.write(buf)
+    }
+    #[inline]
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
+        self.0.write_vectored(bufs)
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        self.0.is_write_vectored()
+    }
+}
+
+#[cfg(unix)]
+mod unix;
+
+#[cfg(windows)]
+mod windows;
+
+#[cfg(test)]
+mod tests;
diff --git a/library/std/src/sys/anonymous_pipe/tests.rs b/library/std/src/sys/anonymous_pipe/tests.rs
new file mode 100644
index 0000000000000..8f17422901d62
--- /dev/null
+++ b/library/std/src/sys/anonymous_pipe/tests.rs
@@ -0,0 +1,29 @@
+use super::*;
+use crate::io::{Read, Write};
+
+#[test]
+fn pipe_creation_and_rw() {
+    let (mut rx, mut tx) = pipe().unwrap();
+    tx.write_all(b"12345").unwrap();
+    drop(tx);
+
+    let mut s = String::new();
+    rx.read_to_string(&mut s).unwrap();
+    assert_eq!(s, "12345");
+}
+
+#[test]
+fn pipe_try_clone_and_rw() {
+    let (mut rx, mut tx) = pipe().unwrap();
+    tx.try_clone().unwrap().write_all(b"12").unwrap();
+    tx.write_all(b"345").unwrap();
+    drop(tx);
+
+    let mut s = String::new();
+    rx.try_clone().unwrap().take(3).read_to_string(&mut s).unwrap();
+    assert_eq!(s, "123");
+
+    s.clear();
+    rx.read_to_string(&mut s).unwrap();
+    assert_eq!(s, "45");
+}
diff --git a/library/std/src/sys/anonymous_pipe/unix.rs b/library/std/src/sys/anonymous_pipe/unix.rs
new file mode 100644
index 0000000000000..833f210dc65b6
--- /dev/null
+++ b/library/std/src/sys/anonymous_pipe/unix.rs
@@ -0,0 +1,108 @@
+use super::*;
+
+use crate::{
+    os::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd},
+    process::Stdio,
+    sys::{
+        fd::FileDesc,
+        pipe::{anon_pipe, AnonPipe},
+    },
+    sys_common::{FromInner, IntoInner},
+};
+
+#[inline]
+pub(super) fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
+    anon_pipe().map(|(rx, tx)| (PipeReader(rx), PipeWriter(tx)))
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsFd for PipeReader {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        self.0.as_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsRawFd for PipeReader {
+    fn as_raw_fd(&self) -> RawFd {
+        self.0.as_raw_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeReader> for OwnedFd {
+    fn from(pipe: PipeReader) -> Self {
+        FileDesc::into_inner(AnonPipe::into_inner(pipe.0))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl FromRawFd for PipeReader {
+    unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
+        Self(AnonPipe::from_raw_fd(raw_fd))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl IntoRawFd for PipeReader {
+    fn into_raw_fd(self) -> RawFd {
+        self.0.into_raw_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeReader> for Stdio {
+    fn from(pipe: PipeReader) -> Self {
+        Self::from(OwnedFd::from(pipe))
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsFd for PipeWriter {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        self.0.as_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsRawFd for PipeWriter {
+    fn as_raw_fd(&self) -> RawFd {
+        self.0.as_raw_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeWriter> for OwnedFd {
+    fn from(pipe: PipeWriter) -> Self {
+        FileDesc::into_inner(AnonPipe::into_inner(pipe.0))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl FromRawFd for PipeWriter {
+    unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
+        Self(AnonPipe::from_raw_fd(raw_fd))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl IntoRawFd for PipeWriter {
+    fn into_raw_fd(self) -> RawFd {
+        self.0.into_raw_fd()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeWriter> for Stdio {
+    fn from(pipe: PipeWriter) -> Self {
+        Self::from(OwnedFd::from(pipe))
+    }
+}
+
+fn convert_to_pipe(owned_fd: OwnedFd) -> AnonPipe {
+    AnonPipe::from_inner(FileDesc::from_inner(OwnedFd::from(owned_fd)))
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<OwnedFd> for PipeReader {
+    fn from(owned_fd: OwnedFd) -> Self {
+        Self(convert_to_pipe(owned_fd))
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<OwnedFd> for PipeWriter {
+    fn from(owned_fd: OwnedFd) -> Self {
+        Self(convert_to_pipe(owned_fd))
+    }
+}
diff --git a/library/std/src/sys/anonymous_pipe/windows.rs b/library/std/src/sys/anonymous_pipe/windows.rs
new file mode 100644
index 0000000000000..d5398c3cc9ca8
--- /dev/null
+++ b/library/std/src/sys/anonymous_pipe/windows.rs
@@ -0,0 +1,114 @@
+use super::*;
+
+use crate::{
+    os::windows::io::{
+        AsHandle, AsRawHandle, BorrowedHandle, FromRawHandle, IntoRawHandle, OwnedHandle, RawHandle,
+    },
+    process::Stdio,
+    sys::{
+        handle::Handle,
+        pipe::{anon_pipe, AnonPipe, Pipes},
+    },
+    sys_common::{FromInner, IntoInner},
+};
+
+#[inline]
+pub(super) fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
+    anon_pipe(true, false).map(|Pipes { ours, theirs }| (PipeReader(ours), PipeWriter(theirs)))
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsHandle for PipeReader {
+    fn as_handle(&self) -> BorrowedHandle<'_> {
+        self.0.handle().as_handle()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsRawHandle for PipeReader {
+    fn as_raw_handle(&self) -> RawHandle {
+        self.0.handle().as_raw_handle()
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl FromRawHandle for PipeReader {
+    unsafe fn from_raw_handle(raw_handle: RawHandle) -> Self {
+        Self(AnonPipe::from_inner(Handle::from_raw_handle(raw_handle)))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl IntoRawHandle for PipeReader {
+    fn into_raw_handle(self) -> RawHandle {
+        self.0.into_handle().into_raw_handle()
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeReader> for OwnedHandle {
+    fn from(pipe: PipeReader) -> Self {
+        Handle::into_inner(AnonPipe::into_inner(pipe.0))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeReader> for Stdio {
+    fn from(pipe: PipeReader) -> Self {
+        Self::from(OwnedHandle::from(pipe))
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsHandle for PipeWriter {
+    fn as_handle(&self) -> BorrowedHandle<'_> {
+        self.0.handle().as_handle()
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl AsRawHandle for PipeWriter {
+    fn as_raw_handle(&self) -> RawHandle {
+        self.0.handle().as_raw_handle()
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl FromRawHandle for PipeWriter {
+    unsafe fn from_raw_handle(raw_handle: RawHandle) -> Self {
+        Self(AnonPipe::from_inner(Handle::from_raw_handle(raw_handle)))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl IntoRawHandle for PipeWriter {
+    fn into_raw_handle(self) -> RawHandle {
+        self.0.into_handle().into_raw_handle()
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeWriter> for OwnedHandle {
+    fn from(pipe: PipeWriter) -> Self {
+        Handle::into_inner(AnonPipe::into_inner(pipe.0))
+    }
+}
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<PipeWriter> for Stdio {
+    fn from(pipe: PipeWriter) -> Self {
+        Self::from(OwnedHandle::from(pipe))
+    }
+}
+
+fn convert_to_pipe(owned_handle: OwnedHandle) -> AnonPipe {
+    AnonPipe::from_inner(Handle::from_inner(owned_handle))
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<OwnedHandle> for PipeReader {
+    fn from(owned_handle: OwnedHandle) -> Self {
+        Self(convert_to_pipe(owned_handle))
+    }
+}
+
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+impl From<OwnedHandle> for PipeWriter {
+    fn from(owned_handle: OwnedHandle) -> Self {
+        Self(convert_to_pipe(owned_handle))
+    }
+}
diff --git a/library/std/src/sys/mod.rs b/library/std/src/sys/mod.rs
index 4092e6080d548..99b6207e6d243 100644
--- a/library/std/src/sys/mod.rs
+++ b/library/std/src/sys/mod.rs
@@ -5,6 +5,8 @@ mod pal;
 
 mod personality;
 
+#[unstable(feature = "anonymous_pipe", issue = "127154")]
+pub mod anonymous_pipe;
 pub mod backtrace;
 pub mod cmath;
 pub mod exit_guard;
diff --git a/library/std/src/sys/pal/unix/pipe.rs b/library/std/src/sys/pal/unix/pipe.rs
index 33db24e77e4da..8762af614f17e 100644
--- a/library/std/src/sys/pal/unix/pipe.rs
+++ b/library/std/src/sys/pal/unix/pipe.rs
@@ -9,6 +9,7 @@ use crate::sys_common::{FromInner, IntoInner};
 // Anonymous pipes
 ////////////////////////////////////////////////////////////////////////////////
 
+#[derive(Debug)]
 pub struct AnonPipe(FileDesc);
 
 pub fn anon_pipe() -> io::Result<(AnonPipe, AnonPipe)> {
@@ -46,6 +47,10 @@ pub fn anon_pipe() -> io::Result<(AnonPipe, AnonPipe)> {
 }
 
 impl AnonPipe {
+    pub fn try_clone(&self) -> io::Result<Self> {
+        self.0.duplicate().map(Self)
+    }
+
     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.0.read(buf)
     }
@@ -79,6 +84,10 @@ impl AnonPipe {
     pub fn is_write_vectored(&self) -> bool {
         self.0.is_write_vectored()
     }
+
+    pub fn as_file_desc(&self) -> &FileDesc {
+        &self.0
+    }
 }
 
 impl IntoInner<FileDesc> for AnonPipe {
diff --git a/library/std/src/sys/pal/unsupported/pipe.rs b/library/std/src/sys/pal/unsupported/pipe.rs
index d7d8f297ae586..781eafe2f1a6b 100644
--- a/library/std/src/sys/pal/unsupported/pipe.rs
+++ b/library/std/src/sys/pal/unsupported/pipe.rs
@@ -1,8 +1,21 @@
-use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut};
+use crate::{
+    fmt,
+    io::{self, BorrowedCursor, IoSlice, IoSliceMut},
+};
 
 pub struct AnonPipe(!);
 
+impl fmt::Debug for AnonPipe {
+    fn fmt(&self, _: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0
+    }
+}
+
 impl AnonPipe {
+    pub fn try_clone(&self) -> io::Result<Self> {
+        self.0
+    }
+
     pub fn read(&self, _buf: &mut [u8]) -> io::Result<usize> {
         self.0
     }
diff --git a/library/std/src/sys/pal/windows/handle.rs b/library/std/src/sys/pal/windows/handle.rs
index 3f85bb0a099a9..5aa2141571953 100644
--- a/library/std/src/sys/pal/windows/handle.rs
+++ b/library/std/src/sys/pal/windows/handle.rs
@@ -17,6 +17,7 @@ use crate::sys_common::{AsInner, FromInner, IntoInner};
 /// An owned container for `HANDLE` object, closing them on Drop.
 ///
 /// All methods are inherited through a `Deref` impl to `RawHandle`
+#[derive(Debug)]
 pub struct Handle(OwnedHandle);
 
 impl Handle {
diff --git a/library/std/src/sys/pal/windows/pipe.rs b/library/std/src/sys/pal/windows/pipe.rs
index 67ef3ca82da02..6e6ba721d00fa 100644
--- a/library/std/src/sys/pal/windows/pipe.rs
+++ b/library/std/src/sys/pal/windows/pipe.rs
@@ -19,6 +19,7 @@ use crate::sys_common::{FromInner, IntoInner};
 // Anonymous pipes
 ////////////////////////////////////////////////////////////////////////////////
 
+#[derive(Debug)]
 pub struct AnonPipe {
     inner: Handle,
 }
@@ -182,7 +183,7 @@ pub fn spawn_pipe_relay(
     their_handle_inheritable: bool,
 ) -> io::Result<AnonPipe> {
     // We need this handle to live for the lifetime of the thread spawned below.
-    let source = source.duplicate()?;
+    let source = source.try_clone()?;
 
     // create a new pair of anon pipes.
     let Pipes { theirs, ours } = anon_pipe(ours_readable, their_handle_inheritable)?;
@@ -238,7 +239,8 @@ impl AnonPipe {
     pub fn into_handle(self) -> Handle {
         self.inner
     }
-    fn duplicate(&self) -> io::Result<Self> {
+
+    pub fn try_clone(&self) -> io::Result<Self> {
         self.inner.duplicate(0, false, c::DUPLICATE_SAME_ACCESS).map(|inner| AnonPipe { inner })
     }
 
diff --git a/src/bootstrap/README.md b/src/bootstrap/README.md
index fb3c862704306..0ac58645d2dfc 100644
--- a/src/bootstrap/README.md
+++ b/src/bootstrap/README.md
@@ -1,7 +1,7 @@
-# rustbuild - Bootstrapping Rust
+# Bootstrapping Rust
 
 This README is aimed at helping to explain how Rust is bootstrapped,
-and some of the technical details of the build system.
+and some of the technical details of the bootstrap build system.
 
 Note that this README only covers internal information, not how to use the tool.
 Please check [bootstrapping dev guide][bootstrapping-dev-guide] for further information.
@@ -12,17 +12,17 @@ Please check [bootstrapping dev guide][bootstrapping-dev-guide] for further info
 
 The build system defers most of the complicated logic of managing invocations
 of rustc and rustdoc to Cargo itself. However, moving through various stages
-and copying artifacts is still necessary for it to do. Each time rustbuild
+and copying artifacts is still necessary for it to do. Each time bootstrap
 is invoked, it will iterate through the list of predefined steps and execute
 each serially in turn if it matches the paths passed or is a default rule.
-For each step, rustbuild relies on the step internally being incremental and
-parallel. Note, though, that the `-j` parameter to rustbuild gets forwarded
+For each step, bootstrap relies on the step internally being incremental and
+parallel. Note, though, that the `-j` parameter to bootstrap gets forwarded
 to appropriate test harnesses and such.
 
 ## Build phases
 
-The rustbuild build system goes through a few phases to actually build the
-compiler. What actually happens when you invoke rustbuild is:
+Bootstrap build system goes through a few phases to actually build the
+compiler. What actually happens when you invoke bootstrap is:
 
 1. The entry point script (`x` for unix like systems, `x.ps1` for windows systems,
    `x.py` cross-platform) is run. This script is responsible for downloading the stage0
@@ -151,9 +151,9 @@ build/
     stage3/
 ```
 
-## Extending rustbuild
+## Extending bootstrap
 
-When you use the bootstrap system, you'll call it through the entry point script
+When you use bootstrap, you'll call it through the entry point script
 (`x`, `x.ps1`, or `x.py`). However, most of the code lives in `src/bootstrap`.
 `bootstrap` has a difficult problem: it is written in Rust, but yet it is run
 before the Rust compiler is built! To work around this, there are two components
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 7e47b373ff9df..4e8e0fd2532f1 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -1038,7 +1038,7 @@ def build_triple(self):
 
     def check_vendored_status(self):
         """Check that vendoring is configured properly"""
-        # keep this consistent with the equivalent check in rustbuild:
+        # keep this consistent with the equivalent check in bootstrap:
         # https://github.com/rust-lang/rust/blob/a8a33cf27166d3eabaffc58ed3799e054af3b0c6/src/bootstrap/lib.rs#L399-L405
         if 'SUDO_USER' in os.environ and not self.use_vendored_sources:
             if os.getuid() == 0:
diff --git a/src/bootstrap/mk/Makefile.in b/src/bootstrap/mk/Makefile.in
index cab37e0da4736..f85aefcb268d3 100644
--- a/src/bootstrap/mk/Makefile.in
+++ b/src/bootstrap/mk/Makefile.in
@@ -20,7 +20,7 @@ all:
 	$(Q)$(BOOTSTRAP) doc --stage 2 $(BOOTSTRAP_ARGS)
 
 help:
-	$(Q)echo 'Welcome to the rustbuild build system!'
+	$(Q)echo 'Welcome to bootstrap, the Rust build system!'
 	$(Q)echo
 	$(Q)echo This makefile is a thin veneer over the ./x.py script located
 	$(Q)echo in this directory. To get the full power of the build system
diff --git a/src/bootstrap/src/bin/main.rs b/src/bootstrap/src/bin/main.rs
index 44fb1911fc6d3..a7d21ba6ae127 100644
--- a/src/bootstrap/src/bin/main.rs
+++ b/src/bootstrap/src/bin/main.rs
@@ -1,4 +1,4 @@
-//! rustbuild, the Rust build system
+//! bootstrap, the Rust build system
 //!
 //! This is the entry point for the build system used to compile the `rustc`
 //! compiler. Lots of documentation can be found in the `README.md` file in the
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index ef2af9c287336..039a7b2fc276d 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -1,7 +1,7 @@
 //! Implementation of compiling various phases of the compiler and standard
 //! library.
 //!
-//! This module contains some of the real meat in the rustbuild build system
+//! This module contains some of the real meat in the bootstrap build system
 //! which is where Cargo is used to compile the standard library, libtest, and
 //! the compiler. This module is also responsible for assembling the sysroot as it
 //! goes along from the output of the previous stage.
@@ -818,8 +818,8 @@ pub struct Rustc {
     pub compiler: Compiler,
     /// Whether to build a subset of crates, rather than the whole compiler.
     ///
-    /// This should only be requested by the user, not used within rustbuild itself.
-    /// Using it within rustbuild can lead to confusing situation where lints are replayed
+    /// This should only be requested by the user, not used within bootstrap itself.
+    /// Using it within bootstrap can lead to confusing situation where lints are replayed
     /// in two different steps.
     crates: Vec<String>,
 }
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index dc46af6cf4868..633e66afe598d 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -1,4 +1,4 @@
-//! Documentation generation for rustbuilder.
+//! Documentation generation for bootstrap.
 //!
 //! This module implements generation for all bits and pieces of documentation
 //! for the Rust project. This notably includes suites like the rust book, the
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 9b4c7c9134976..4d69d6b523111 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -682,6 +682,8 @@ impl Step for CompiletestTest {
         let mut cargo = tool::prepare_tool_cargo(
             builder,
             compiler,
+            // compiletest uses libtest internals; make it use the in-tree std to make sure it never breaks
+            // when std sources change.
             Mode::ToolStd,
             host,
             "test",
@@ -1321,13 +1323,12 @@ impl Step for CrateRunMakeSupport {
     /// Runs `cargo test` for run-make-support.
     fn run(self, builder: &Builder<'_>) {
         let host = self.host;
-        let compiler = builder.compiler(builder.top_stage, host);
+        let compiler = builder.compiler(0, host);
 
-        builder.ensure(compile::Std::new(compiler, host));
         let mut cargo = tool::prepare_tool_cargo(
             builder,
             compiler,
-            Mode::ToolStd,
+            Mode::ToolBootstrap,
             host,
             "test",
             "src/tools/run-make-support",
@@ -3043,7 +3044,7 @@ impl Step for Bootstrap {
             // https://github.com/rust-lang/rust/issues/49215
             cmd.env("RUSTFLAGS", flags);
         }
-        // rustbuild tests are racy on directory creation so just run them one at a time.
+        // bootstrap tests are racy on directory creation so just run them one at a time.
         // Since there's not many this shouldn't be a problem.
         run_cargo_test(cmd, &["--test-threads=1"], &[], "bootstrap", None, compiler, host, builder);
     }
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index b14a0c5f072cd..aeb3474360801 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -1627,11 +1627,11 @@ impl<'a> Builder<'a> {
         }
 
         // This tells Cargo (and in turn, rustc) to output more complete
-        // dependency information.  Most importantly for rustbuild, this
+        // dependency information.  Most importantly for bootstrap, this
         // includes sysroot artifacts, like libstd, which means that we don't
-        // need to track those in rustbuild (an error prone process!). This
+        // need to track those in bootstrap (an error prone process!). This
         // feature is currently unstable as there may be some bugs and such, but
-        // it represents a big improvement in rustbuild's reliability on
+        // it represents a big improvement in bootstrap's reliability on
         // rebuilds, so we're using it here.
         //
         // For some additional context, see #63470 (the PR originally adding
@@ -1643,7 +1643,7 @@ impl<'a> Builder<'a> {
                 // Restrict the allowed features so we don't depend on nightly
                 // accidentally.
                 //
-                // binary-dep-depinfo is used by rustbuild itself for all
+                // binary-dep-depinfo is used by bootstrap itself for all
                 // compilations.
                 //
                 // Lots of tools depend on proc_macro2 and proc-macro-error.
diff --git a/src/bootstrap/src/core/builder/tests.rs b/src/bootstrap/src/core/builder/tests.rs
index aa119b8c69912..97c9ece0036ea 100644
--- a/src/bootstrap/src/core/builder/tests.rs
+++ b/src/bootstrap/src/core/builder/tests.rs
@@ -266,7 +266,7 @@ mod defaults {
         // rustdoc/rustcc/std here (the user only requested a host=B build, so
         // there's not really a need for us to build for target A in this case
         // (since we're producing stage 1 libraries/binaries).  But currently
-        // rustbuild is just a bit buggy here; this should be fixed though.
+        // bootstrap is just a bit buggy here; this should be fixed though.
         assert_eq!(
             first(cache.all::<compile::Std>()),
             &[
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 11207cf893542..b777167ebe5da 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -658,8 +658,7 @@ impl Merge for TomlConfig {
     }
 }
 
-// We are using a decl macro instead of a derive proc macro here to reduce the compile time of
-// rustbuild.
+// We are using a decl macro instead of a derive proc macro here to reduce the compile time of bootstrap.
 macro_rules! define_config {
     ($(#[$attr:meta])* struct $name:ident {
         $($field:ident: Option<$field_ty:ty> = $field_key:literal,)*
@@ -704,7 +703,7 @@ macro_rules! define_config {
 
         // The following is a trimmed version of what serde_derive generates. All parts not relevant
         // for toml deserialization have been removed. This reduces the binary size and improves
-        // compile time of rustbuild.
+        // compile time of bootstrap.
         impl<'de> Deserialize<'de> for $name {
             fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
             where
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index aeb608a9ea26b..19f752da81c13 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -1,4 +1,4 @@
-//! Command-line interface of the rustbuild build system.
+//! Command-line interface of the bootstrap build system.
 //!
 //! This module implements the command-line parsing of the build system which
 //! has various flags to configure how it's run.
diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index 4bdc8ac07958f..2be819d52ea1a 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -1,4 +1,4 @@
-//! Sanity checking performed by rustbuild before actually executing anything.
+//! Sanity checking performed by bootstrap before actually executing anything.
 //!
 //! This module contains the implementation of ensuring that the build
 //! environment looks reasonable before progressing. This will verify that
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index 10ec7d135f0ca..daa916ce0a070 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -1,9 +1,9 @@
-//! Implementation of rustbuild, the Rust build system.
+//! Implementation of bootstrap, the Rust build system.
 //!
 //! This module, and its descendants, are the implementation of the Rust build
 //! system. Most of this build system is backed by Cargo but the outer layer
 //! here serves as the ability to orchestrate calling Cargo, sequencing Cargo
-//! builds, building artifacts like LLVM, etc. The goals of rustbuild are:
+//! builds, building artifacts like LLVM, etc. The goals of bootstrap are:
 //!
 //! * To be an easily understandable, easily extensible, and maintainable build
 //!   system.
diff --git a/src/bootstrap/src/utils/helpers.rs b/src/bootstrap/src/utils/helpers.rs
index f695b3229fe66..15133e441b491 100644
--- a/src/bootstrap/src/utils/helpers.rs
+++ b/src/bootstrap/src/utils/helpers.rs
@@ -1,4 +1,4 @@
-//! Various utility functions used throughout rustbuild.
+//! Various utility functions used throughout bootstrap.
 //!
 //! Simple things like testing the various filesystem operations here and there,
 //! not a lot of interesting happenings here unfortunately.
diff --git a/src/ci/scripts/install-clang.sh b/src/ci/scripts/install-clang.sh
index 24b9904d65c25..6103aa61248ae 100755
--- a/src/ci/scripts/install-clang.sh
+++ b/src/ci/scripts/install-clang.sh
@@ -40,7 +40,7 @@ if isMacOS; then
     # our own clang can figure out the correct include path on its own.
     ciCommandSetEnv SDKROOT "$(xcrun --sdk macosx --show-sdk-path)"
 
-    # Configure `AR` specifically so rustbuild doesn't try to infer it as
+    # Configure `AR` specifically so bootstrap doesn't try to infer it as
     # `clang-ar` by accident.
     ciCommandSetEnv AR "ar"
 elif isWindows && ! isKnownToBeMingwBuild; then
diff --git a/src/doc/rustc/src/platform-support/x86_64-fortanix-unknown-sgx.md b/src/doc/rustc/src/platform-support/x86_64-fortanix-unknown-sgx.md
index 97b5827c1443f..33e1c44e6d351 100644
--- a/src/doc/rustc/src/platform-support/x86_64-fortanix-unknown-sgx.md
+++ b/src/doc/rustc/src/platform-support/x86_64-fortanix-unknown-sgx.md
@@ -46,7 +46,7 @@ on how to setup a development and runtime environment.
 
 As a tier 2 target, the target is built by the Rust project.
 
-You can configure rustbuild like so:
+You can configure bootstrap like so:
 
 ```toml
 [build]
diff --git a/src/tools/build_helper/src/ci.rs b/src/tools/build_helper/src/ci.rs
index 09489b0d9b7da..233fed4151c19 100644
--- a/src/tools/build_helper/src/ci.rs
+++ b/src/tools/build_helper/src/ci.rs
@@ -25,7 +25,7 @@ impl CiEnv {
     /// If in a CI environment, forces the command to run with colors.
     pub fn force_coloring_in_ci(self, cmd: &mut Command) {
         if self != CiEnv::None {
-            // Due to use of stamp/docker, the output stream of rustbuild is not
+            // Due to use of stamp/docker, the output stream of bootstrap is not
             // a TTY in CI, so coloring is by-default turned off.
             // The explicit `TERM=xterm` environment is needed for
             // `--color always` to actually work. This env var was lost when
diff --git a/src/tools/lint-docs/src/groups.rs b/src/tools/lint-docs/src/groups.rs
index f246d71d499b4..9eaa234bfaf30 100644
--- a/src/tools/lint-docs/src/groups.rs
+++ b/src/tools/lint-docs/src/groups.rs
@@ -37,7 +37,7 @@ impl<'a> LintExtractor<'a> {
             .map_err(|e| format!("could not read {}: {}", groups_path.display(), e))?;
         let new_contents =
             contents.replace("{{groups-table}}", &self.make_groups_table(lints, &groups)?);
-        // Delete the output because rustbuild uses hard links in its copies.
+        // Delete the output because bootstrap uses hard links in its copies.
         let _ = fs::remove_file(&groups_path);
         fs::write(&groups_path, new_contents)
             .map_err(|e| format!("could not write to {}: {}", groups_path.display(), e))?;
diff --git a/src/tools/lint-docs/src/lib.rs b/src/tools/lint-docs/src/lib.rs
index 72d6a495e7e79..48e2dd098769e 100644
--- a/src/tools/lint-docs/src/lib.rs
+++ b/src/tools/lint-docs/src/lib.rs
@@ -532,7 +532,7 @@ impl<'a> LintExtractor<'a> {
         }
         add_rename_redirect(level, &mut result);
         let out_path = self.out_path.join("listing").join(level.doc_filename());
-        // Delete the output because rustbuild uses hard links in its copies.
+        // Delete the output because bootstrap uses hard links in its copies.
         let _ = fs::remove_file(&out_path);
         fs::write(&out_path, result)
             .map_err(|e| format!("could not write to {}: {}", out_path.display(), e))?;
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/version.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/version.rs
index 1e829299e6f3c..2ff967416c006 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/version.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/version.rs
@@ -15,7 +15,7 @@ pub struct VersionInfo {
     pub version: &'static str,
     /// The release channel we were built for (stable/beta/nightly/dev).
     ///
-    /// `None` if not built via rustbuild.
+    /// `None` if not built via bootstrap.
     pub release_channel: Option<&'static str>,
     /// Information about the Git repository we may have been built from.
     ///
diff --git a/src/tools/rust-installer/src/combiner.rs b/src/tools/rust-installer/src/combiner.rs
index c211b34850a07..e7020980dc3d6 100644
--- a/src/tools/rust-installer/src/combiner.rs
+++ b/src/tools/rust-installer/src/combiner.rs
@@ -109,7 +109,7 @@ impl Combiner {
                 .with_context(|| format!("failed to read components in '{}'", input_tarball))?;
             for component in pkg_components.split_whitespace() {
                 // All we need to do is copy the component directory. We could
-                // move it, but rustbuild wants to reuse the unpacked package
+                // move it, but bootstrap wants to reuse the unpacked package
                 // dir for OS-specific installers on macOS and Windows.
                 let component_dir = package_dir.join(component);
                 create_dir(&component_dir)?;
diff --git a/src/tools/rust-installer/test.sh b/src/tools/rust-installer/test.sh
index 16b05c66197c8..7b3e745600629 100755
--- a/src/tools/rust-installer/test.sh
+++ b/src/tools/rust-installer/test.sh
@@ -974,7 +974,7 @@ combined_remains() {
     --package-name=rust \
     --input-tarballs="$OUT_DIR/rustc.tar.gz,$OUT_DIR/cargo.tar.gz,$OUT_DIR/rust-docs.tar.gz"
     for component in rustc cargo rust-docs; do
-    # rustbuild wants the original extracted package intact too
+    # bootstrap wants the original extracted package intact too
     try test -d "$WORK_DIR/$component/$component"
     try test -d "$WORK_DIR/rust/$component"
     done
diff --git a/tests/mir-opt/dest-prop/branch.rs b/tests/mir-opt/dest-prop/branch.rs
index 481d4130c7b59..0ac79ee4ec293 100644
--- a/tests/mir-opt/dest-prop/branch.rs
+++ b/tests/mir-opt/dest-prop/branch.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //! Tests that assignment in both branches of an `if` are eliminated.
 //@ test-mir-pass: DestinationPropagation
@@ -12,6 +11,10 @@ fn cond() -> bool {
 
 // EMIT_MIR branch.foo.DestinationPropagation.diff
 fn foo() -> i32 {
+    // CHECK-LABEL: fn foo(
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: [[y]] = val()
+    // CHECK-NOT: [[y]] = {{_.*}};
     let x = val();
 
     let y = if cond() {
diff --git a/tests/mir-opt/dest-prop/copy_propagation_arg.rs b/tests/mir-opt/dest-prop/copy_propagation_arg.rs
index db4969924ffb9..084bd0544c175 100644
--- a/tests/mir-opt/dest-prop/copy_propagation_arg.rs
+++ b/tests/mir-opt/dest-prop/copy_propagation_arg.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // Check that DestinationPropagation does not propagate an assignment to a function argument
 // (doing so can break usages of the original argument value)
@@ -9,18 +8,29 @@ fn dummy(x: u8) -> u8 {
 
 // EMIT_MIR copy_propagation_arg.foo.DestinationPropagation.diff
 fn foo(mut x: u8) {
+    // CHECK-LABEL: fn foo(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: dummy(move [[x]])
+    // CHECK: [[x]] = move {{_.*}};
     // calling `dummy` to make a use of `x` that copyprop cannot eliminate
     x = dummy(x); // this will assign a local to `x`
 }
 
 // EMIT_MIR copy_propagation_arg.bar.DestinationPropagation.diff
 fn bar(mut x: u8) {
+    // CHECK-LABEL: fn bar(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: dummy(move [[x]])
+    // CHECK: [[x]] = const 5_u8;
     dummy(x);
     x = 5;
 }
 
 // EMIT_MIR copy_propagation_arg.baz.DestinationPropagation.diff
 fn baz(mut x: i32) -> i32 {
+    // CHECK-LABEL: fn baz(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK-NOT: [[x]] =
     // self-assignment to a function argument should be eliminated
     x = x;
     x
@@ -28,6 +38,12 @@ fn baz(mut x: i32) -> i32 {
 
 // EMIT_MIR copy_propagation_arg.arg_src.DestinationPropagation.diff
 fn arg_src(mut x: i32) -> i32 {
+    // CHECK-LABEL: fn arg_src(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: [[y]] = [[x]]
+    // CHECK: [[x]] = const 123_i32;
+    // CHECK-NOT: {{_.*}} = [[y]];
     let y = x;
     x = 123; // Don't propagate this assignment to `y`
     y
diff --git a/tests/mir-opt/dest-prop/cycle.rs b/tests/mir-opt/dest-prop/cycle.rs
index e414daf20f2dd..86b9b713fd001 100644
--- a/tests/mir-opt/dest-prop/cycle.rs
+++ b/tests/mir-opt/dest-prop/cycle.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //! Tests that cyclic assignments don't hang DestinationPropagation, and result in reasonable code.
 //@ test-mir-pass: DestinationPropagation
@@ -8,6 +7,10 @@ fn val() -> i32 {
 
 // EMIT_MIR cycle.main.DestinationPropagation.diff
 fn main() {
+    // CHECK-LABEL: main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: [[x]] = val()
+    // CHECK-NOT: [[x]] = {{_.*}};
     let mut x = val();
     let y = x;
     let z = y;
diff --git a/tests/mir-opt/dest-prop/dead_stores_79191.rs b/tests/mir-opt/dest-prop/dead_stores_79191.rs
index 5c218a328f584..61060e4f8506b 100644
--- a/tests/mir-opt/dest-prop/dead_stores_79191.rs
+++ b/tests/mir-opt/dest-prop/dead_stores_79191.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //@ test-mir-pass: DestinationPropagation
 
@@ -8,6 +7,13 @@ fn id<T>(x: T) -> T {
 
 // EMIT_MIR dead_stores_79191.f.DestinationPropagation.after.mir
 fn f(mut a: usize) -> usize {
+    // CHECK-LABEL: fn f(
+    // CHECK: debug a => [[a:_.*]];
+    // CHECK: debug b => [[b:_.*]];
+    // CHECK: [[b]] = [[a]];
+    // CHECK: [[a]] = const 5_usize;
+    // CHECK: [[a]] = move [[b]];
+    // CHECK: id::<usize>(move [[a]])
     let b = a;
     a = 5;
     a = b;
diff --git a/tests/mir-opt/dest-prop/dead_stores_better.rs b/tests/mir-opt/dest-prop/dead_stores_better.rs
index 06445dc87031e..d2b9fe0571234 100644
--- a/tests/mir-opt/dest-prop/dead_stores_better.rs
+++ b/tests/mir-opt/dest-prop/dead_stores_better.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // This is a copy of the `dead_stores_79191` test, except that we turn on DSE. This demonstrates
 // that that pass enables this one to do more optimizations.
@@ -12,6 +11,13 @@ fn id<T>(x: T) -> T {
 
 // EMIT_MIR dead_stores_better.f.DestinationPropagation.after.mir
 pub fn f(mut a: usize) -> usize {
+    // CHECK-LABEL: fn f(
+    // CHECK: debug a => [[a:_.*]];
+    // CHECK: debug b => [[b:_.*]];
+    // CHECK: [[b]] = [[a]];
+    // CHECK: [[a]] = const 5_usize;
+    // CHECK: [[a]] = move [[b]];
+    // CHECK: id::<usize>(move [[a]])
     let b = a;
     a = 5;
     a = b;
diff --git a/tests/mir-opt/dest-prop/simple.rs b/tests/mir-opt/dest-prop/simple.rs
index 8e5d6340e566f..833d49b8c4665 100644
--- a/tests/mir-opt/dest-prop/simple.rs
+++ b/tests/mir-opt/dest-prop/simple.rs
@@ -1,9 +1,15 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //! Copy of `nrvo-simple.rs`, to ensure that full dest-prop handles it too.
 //@ test-mir-pass: DestinationPropagation
 // EMIT_MIR simple.nrvo.DestinationPropagation.diff
 fn nrvo(init: fn(&mut [u8; 1024])) -> [u8; 1024] {
+    // CHECK-LABEL: fn nrvo(
+    // CHECK: debug init => [[init:_.*]];
+    // CHECK: debug buf => [[buf:_.*]];
+    // CHECK: [[buf]] = [const 0_u8; 1024];
+    // CHECK-NOT: {{_.*}} = [[init]];
+    // CHECK: move [[init]](move {{_.*}})
+    // CHECK: {{_.*}} = [[buf]]
     let mut buf = [0; 1024];
     init(&mut buf);
     buf
diff --git a/tests/mir-opt/dest-prop/union.rs b/tests/mir-opt/dest-prop/union.rs
index 66fadd8471225..4e6fb71bf75ec 100644
--- a/tests/mir-opt/dest-prop/union.rs
+++ b/tests/mir-opt/dest-prop/union.rs
@@ -8,6 +8,8 @@ fn val() -> u32 {
 
 // EMIT_MIR union.main.DestinationPropagation.diff
 fn main() {
+    // CHECK-LABEL: fn args(
+    // CHECK: {{_.*}} = Un { us: const 1_u32 };
     union Un {
         us: u32,
     }
diff --git a/tests/rustdoc/issue-102154.rs b/tests/rustdoc-ui/ice-assoc-type-loop-102154.rs
similarity index 73%
rename from tests/rustdoc/issue-102154.rs
rename to tests/rustdoc-ui/ice-assoc-type-loop-102154.rs
index b36f270806ff3..68e22ce6ea154 100644
--- a/tests/rustdoc/issue-102154.rs
+++ b/tests/rustdoc-ui/ice-assoc-type-loop-102154.rs
@@ -1,3 +1,6 @@
+//@ check-pass
+// https://github.com/rust-lang/rust/issues/102154
+
 trait A<Y, N> {
     type B;
 }
diff --git a/tests/rustdoc/issue-100620.rs b/tests/rustdoc-ui/ice-method-where-clause-circular-100620.rs
similarity index 79%
rename from tests/rustdoc/issue-100620.rs
rename to tests/rustdoc-ui/ice-method-where-clause-circular-100620.rs
index 097666eb515d1..e12b214410bc2 100644
--- a/tests/rustdoc/issue-100620.rs
+++ b/tests/rustdoc-ui/ice-method-where-clause-circular-100620.rs
@@ -1,3 +1,6 @@
+//@ check-pass
+// https://github.com/rust-lang/rust/issues/100620
+
 pub trait Bar<S> {}
 
 pub trait Qux<T> {}
diff --git a/tests/rustdoc/issue-100241.rs b/tests/rustdoc-ui/ice-unresolved-import-100241.rs
similarity index 77%
rename from tests/rustdoc/issue-100241.rs
rename to tests/rustdoc-ui/ice-unresolved-import-100241.rs
index e4c613dd2791e..eef4b8355bfd7 100644
--- a/tests/rustdoc/issue-100241.rs
+++ b/tests/rustdoc-ui/ice-unresolved-import-100241.rs
@@ -3,6 +3,8 @@
 // Check that this isn't an ICE
 //@ should-fail
 
+// https://github.com/rust-lang/rust/issues/100241
+
 mod foo {
     pub use inner::S;
     //~^ ERROR unresolved imports `inner`, `foo::S`
diff --git a/tests/rustdoc/issue-108281.rs b/tests/rustdoc/attributes-inlining-108281.rs
similarity index 100%
rename from tests/rustdoc/issue-108281.rs
rename to tests/rustdoc/attributes-inlining-108281.rs
diff --git a/tests/rustdoc/issue-101743-bold-tag.rs b/tests/rustdoc/bold-tag-101743.rs
similarity index 100%
rename from tests/rustdoc/issue-101743-bold-tag.rs
rename to tests/rustdoc/bold-tag-101743.rs
diff --git a/tests/rustdoc/issue-106421-not-internal.rs b/tests/rustdoc/force-unstable-if-unmarked-106421-not-internal.rs
similarity index 66%
rename from tests/rustdoc/issue-106421-not-internal.rs
rename to tests/rustdoc/force-unstable-if-unmarked-106421-not-internal.rs
index f328a1036ebe9..a85cfa78cdcda 100644
--- a/tests/rustdoc/issue-106421-not-internal.rs
+++ b/tests/rustdoc/force-unstable-if-unmarked-106421-not-internal.rs
@@ -2,7 +2,10 @@
 //@ ignore-cross-compile
 // This is the version where a non-compiler-internal crate inlines a compiler-internal one.
 // In this case, the item shouldn't be documented, because regular users can't get at it.
+// https://github.com/rust-lang/rust/issues/106421
+#![crate_name="bar"]
+
 extern crate foo;
 
-//@ !has issue_106421_not_internal/struct.FatalError.html '//*[@id="method.raise"]' 'fn raise'
+//@ !has bar/struct.FatalError.html '//*[@id="method.raise"]' 'fn raise'
 pub use foo::FatalError;
diff --git a/tests/rustdoc/issue-106421.rs b/tests/rustdoc/force-unstable-if-unmarked-106421.rs
similarity index 53%
rename from tests/rustdoc/issue-106421.rs
rename to tests/rustdoc/force-unstable-if-unmarked-106421.rs
index c2064c7109078..aa88a569aef2f 100644
--- a/tests/rustdoc/issue-106421.rs
+++ b/tests/rustdoc/force-unstable-if-unmarked-106421.rs
@@ -1,8 +1,10 @@
 //@ aux-build:issue-106421-force-unstable.rs
 //@ ignore-cross-compile
 //@ compile-flags: -Zforce-unstable-if-unmarked
+// https://github.com/rust-lang/rust/issues/106421
+#![crate_name="bar"]
 
 extern crate foo;
 
-//@ has issue_106421/struct.FatalError.html '//*[@id="method.raise"]' 'fn raise'
+//@ has bar/struct.FatalError.html '//*[@id="method.raise"]' 'fn raise'
 pub use foo::FatalError;
diff --git a/tests/rustdoc/issue-105952.rs b/tests/rustdoc/ice-associated-const-equality-105952.rs
similarity index 86%
rename from tests/rustdoc/issue-105952.rs
rename to tests/rustdoc/ice-associated-const-equality-105952.rs
index 173efb82f4b98..1bcdfac734290 100644
--- a/tests/rustdoc/issue-105952.rs
+++ b/tests/rustdoc/ice-associated-const-equality-105952.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/105952
 #![crate_name = "foo"]
 
 #![feature(associated_const_equality)]
diff --git a/tests/rustdoc/issue-107995.rs b/tests/rustdoc/ice-intra-doc-links-107995.rs
similarity index 100%
rename from tests/rustdoc/issue-107995.rs
rename to tests/rustdoc/ice-intra-doc-links-107995.rs
diff --git a/tests/rustdoc/issue-100204-inline-impl-through-glob-import.rs b/tests/rustdoc/inline-impl-through-glob-import-100204.rs
similarity index 86%
rename from tests/rustdoc/issue-100204-inline-impl-through-glob-import.rs
rename to tests/rustdoc/inline-impl-through-glob-import-100204.rs
index 7f05e57ec09b0..ba6ed4278716f 100644
--- a/tests/rustdoc/issue-100204-inline-impl-through-glob-import.rs
+++ b/tests/rustdoc/inline-impl-through-glob-import-100204.rs
@@ -2,6 +2,7 @@
 //@ build-aux-docs
 //@ ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/100204
 #![crate_name="second"]
 
 extern crate first;
diff --git a/tests/rustdoc/issue-106142.rs b/tests/rustdoc/issue-106142.rs
deleted file mode 100644
index 52adc5dbbf1a1..0000000000000
--- a/tests/rustdoc/issue-106142.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-//@ has 'issue_106142/a/index.html'
-//@ count 'issue_106142/a/index.html' '//ul[@class="item-table"]//li//a' 1
-
-#![allow(rustdoc::broken_intra_doc_links)]
-
-pub mod a {
-    /// [`m`]
-    pub fn f() {}
-
-    #[macro_export]
-    macro_rules! m {
-        () => {};
-    }
-}
diff --git a/tests/rustdoc/issue-108231.rs b/tests/rustdoc/macro-export-crate-root-108231.rs
similarity index 100%
rename from tests/rustdoc/issue-108231.rs
rename to tests/rustdoc/macro-export-crate-root-108231.rs
diff --git a/tests/rustdoc/macro-rules-broken-intra-doc-106142.rs b/tests/rustdoc/macro-rules-broken-intra-doc-106142.rs
new file mode 100644
index 0000000000000..0d146a3c5cd0c
--- /dev/null
+++ b/tests/rustdoc/macro-rules-broken-intra-doc-106142.rs
@@ -0,0 +1,17 @@
+// https://github.com/rust-lang/rust/issues/106142
+#![crate_name="foo"]
+
+//@ has 'foo/a/index.html'
+//@ count 'foo/a/index.html' '//ul[@class="item-table"]//li//a' 1
+
+#![allow(rustdoc::broken_intra_doc_links)]
+
+pub mod a {
+    /// [`m`]
+    pub fn f() {}
+
+    #[macro_export]
+    macro_rules! m {
+        () => {};
+    }
+}
diff --git a/tests/rustdoc/issue-99734-multiple-foreigns-w-same-name.rs b/tests/rustdoc/multiple-foreigns-w-same-name-99734.rs
similarity index 85%
rename from tests/rustdoc/issue-99734-multiple-foreigns-w-same-name.rs
rename to tests/rustdoc/multiple-foreigns-w-same-name-99734.rs
index d7c4f1db320c7..60a2aa388ee10 100644
--- a/tests/rustdoc/issue-99734-multiple-foreigns-w-same-name.rs
+++ b/tests/rustdoc/multiple-foreigns-w-same-name-99734.rs
@@ -2,6 +2,7 @@
 //@ build-aux-docs
 //@ ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/99734
 #![crate_name = "foo"]
 
 #[macro_use]
diff --git a/tests/rustdoc/issue-99221-multiple-macro-rules-w-same-name.rs b/tests/rustdoc/multiple-macro-rules-w-same-name-99221.rs
similarity index 84%
rename from tests/rustdoc/issue-99221-multiple-macro-rules-w-same-name.rs
rename to tests/rustdoc/multiple-macro-rules-w-same-name-99221.rs
index e7fb4fb3f0ea3..4a1798a849691 100644
--- a/tests/rustdoc/issue-99221-multiple-macro-rules-w-same-name.rs
+++ b/tests/rustdoc/multiple-macro-rules-w-same-name-99221.rs
@@ -2,6 +2,7 @@
 //@ build-aux-docs
 //@ ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/99221
 #![crate_name = "foo"]
 
 #[macro_use]
diff --git a/tests/rustdoc/issue-99734-multiple-mods-w-same-name.rs b/tests/rustdoc/multiple-mods-w-same-name-99734.rs
similarity index 84%
rename from tests/rustdoc/issue-99734-multiple-mods-w-same-name.rs
rename to tests/rustdoc/multiple-mods-w-same-name-99734.rs
index 627cfc0b80b3f..d48464c478f38 100644
--- a/tests/rustdoc/issue-99734-multiple-mods-w-same-name.rs
+++ b/tests/rustdoc/multiple-mods-w-same-name-99734.rs
@@ -2,6 +2,7 @@
 //@ build-aux-docs
 //@ ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/99734
 #![crate_name = "foo"]
 
 #[macro_use]
diff --git a/tests/rustdoc/issue-99221-multiple-structs-w-same-name.rs b/tests/rustdoc/multiple-structs-w-same-name-99221.rs
similarity index 84%
rename from tests/rustdoc/issue-99221-multiple-structs-w-same-name.rs
rename to tests/rustdoc/multiple-structs-w-same-name-99221.rs
index 8758342fe0736..4c2f77fec23d7 100644
--- a/tests/rustdoc/issue-99221-multiple-structs-w-same-name.rs
+++ b/tests/rustdoc/multiple-structs-w-same-name-99221.rs
@@ -2,6 +2,7 @@
 //@ build-aux-docs
 //@ ignore-cross-compile
 
+// https://github.com/rust-lang/rust/issues/99221
 #![crate_name = "foo"]
 
 #[macro_use]
diff --git a/tests/rustdoc/issue-105735-overlapping-reexport-2.rs b/tests/rustdoc/overlapping-reexport-105735-2.rs
similarity index 93%
rename from tests/rustdoc/issue-105735-overlapping-reexport-2.rs
rename to tests/rustdoc/overlapping-reexport-105735-2.rs
index 946184c5a0476..9f823ec5923cd 100644
--- a/tests/rustdoc/issue-105735-overlapping-reexport-2.rs
+++ b/tests/rustdoc/overlapping-reexport-105735-2.rs
@@ -1,4 +1,5 @@
 // Regression test to ensure that both `AtomicU8` items are displayed but not the re-export.
+// https://github.com/rust-lang/rust/issues/105735
 
 #![crate_name = "foo"]
 #![no_std]
diff --git a/tests/rustdoc/issue-105735-overlapping-reexport.rs b/tests/rustdoc/overlapping-reexport-105735.rs
similarity index 93%
rename from tests/rustdoc/issue-105735-overlapping-reexport.rs
rename to tests/rustdoc/overlapping-reexport-105735.rs
index 0fd17fd9577c2..2a2d0fa98309e 100644
--- a/tests/rustdoc/issue-105735-overlapping-reexport.rs
+++ b/tests/rustdoc/overlapping-reexport-105735.rs
@@ -1,4 +1,5 @@
 // Regression test to ensure that both `AtomicU8` items are displayed but not the re-export.
+// https://github.com/rust-lang/rust/issues/105735
 
 #![crate_name = "foo"]
 #![no_std]
diff --git a/tests/rustdoc/issue-107350.rs b/tests/rustdoc/pub-use-loop-107350.rs
similarity index 100%
rename from tests/rustdoc/issue-107350.rs
rename to tests/rustdoc/pub-use-loop-107350.rs
diff --git a/tests/rustdoc/issue-108679-reexport-of-reexport.rs b/tests/rustdoc/reexport-of-reexport-108679.rs
similarity index 100%
rename from tests/rustdoc/issue-108679-reexport-of-reexport.rs
rename to tests/rustdoc/reexport-of-reexport-108679.rs