Auto merge of #56930 - pietroalbini:beta-backports, r=pietroalbini

[beta] Rollup backports

PRs accepted for backport:

* #56781: Update LLVM submodule
* #56615: Update the book to fix some edition-related bugs
* #56562: Update libc version required by rustc
* #56282: Fix #56237: normalize type before deferred sizedness checking.
* Release notes for Rust 1.31.1

Approved PRs targeting beta:

* #56819: [beta] rustdoc: fix line numbers display for [src] pages
* #56893: [beta] Revert "Update CI-clang to 7.0.0 for Linux dists."

r? @ghost

RELEASES.md

@@ -1,3 +1,14 @@
+Version 1.31.1 (2018-12-20)
+===========================
+
+- [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
+- [Fix broken go-to-definition in RLS][rls/1171]
+- [Fix infinite loop on hover in RLS][rls/1170]
+
+[56562]: https://github.com/rust-lang/rust/pull/56562
+[rls/1171]: https://github.com/rust-lang/rls/issues/1171
+[rls/1170]: https://github.com/rust-lang/rls/pull/1170
+
 Version 1.31.0 (2018-12-06)
 ==========================
 

src/ci/docker/dist-i686-linux/Dockerfile

@@ -67,7 +67,7 @@ RUN ./build-gcc.sh
 COPY dist-x86_64-linux/build-python.sh /tmp/
 RUN ./build-python.sh
 
-# Now build LLVM+Clang 7, afterwards configuring further compilations to use the
+# Now build LLVM+Clang 6, afterwards configuring further compilations to use the
 # clang/clang++ compilers.
 COPY dist-x86_64-linux/build-clang.sh /tmp/
 RUN ./build-clang.sh

src/ci/docker/dist-x86_64-linux/Dockerfile

@@ -67,7 +67,7 @@ RUN ./build-gcc.sh
 COPY dist-x86_64-linux/build-python.sh /tmp/
 RUN ./build-python.sh
 
-# Now build LLVM+Clang 7, afterwards configuring further compilations to use the
+# Now build LLVM+Clang 6, afterwards configuring further compilations to use the
 # clang/clang++ compilers.
 COPY dist-x86_64-linux/build-clang.sh /tmp/
 RUN ./build-clang.sh

src/ci/docker/dist-x86_64-linux/build-clang.sh

@@ -13,7 +13,7 @@ set -ex
 
 source shared.sh
 
-LLVM=7.0.0
+LLVM=6.0.0
 
 mkdir clang
 cd clang

src/ci/docker/scripts/musl.sh

@@ -51,7 +51,7 @@ hide_output make clean
 
 cd ..
 
-LLVM=70
+LLVM=60
 
 # may have been downloaded in a previous run
 if [ ! -d libunwind-release_$LLVM ]; then

src/librustc_codegen_ssa/Cargo.toml

@@ -16,7 +16,7 @@ num_cpus = "1.0"
 rustc-demangle = "0.1.4"
 memmap = "0.6"
 log = "0.4.5"
-libc = "0.2.43"
+libc = "0.2.44"
 jobserver = "0.1.11"
 
 serialize = { path = "../libserialize" }

src/librustc_typeck/check/mod.rs

@@ -914,6 +914,7 @@ fn typeck_tables_of<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         fcx.resolve_generator_interiors(def_id);
 
         for (ty, span, code) in fcx.deferred_sized_obligations.borrow_mut().drain(..) {
+            let ty = fcx.normalize_ty(span, ty);
             fcx.require_type_is_sized(ty, span, code);
         }
         fcx.select_all_obligations_or_error();
@@ -3969,15 +3970,27 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                         //
                         // to work in stable even if the Sized bound on `drop` is relaxed.
                         for i in 0..fn_sig.inputs().skip_binder().len() {
-                            let input = tcx.erase_late_bound_regions(&fn_sig.input(i));
+                            // We just want to check sizedness, so instead of introducing
+                            // placeholder lifetimes with probing, we just replace higher lifetimes
+                            // with fresh vars.
+                            let input = self.replace_bound_vars_with_fresh_vars(
+                                expr.span,
+                                infer::LateBoundRegionConversionTime::FnCall,
+                                &fn_sig.input(i)).0;
                             self.require_type_is_sized_deferred(input, expr.span,
                                                                 traits::SizedArgumentType);
                         }
                     }
                     // Here we want to prevent struct constructors from returning unsized types.
                     // There were two cases this happened: fn pointer coercion in stable
                     // and usual function call in presense of unsized_locals.
-                    let output = tcx.erase_late_bound_regions(&fn_sig.output());
+                    // Also, as we just want to check sizedness, instead of introducing
+                    // placeholder lifetimes with probing, we just replace higher lifetimes
+                    // with fresh vars.
+                    let output = self.replace_bound_vars_with_fresh_vars(
+                        expr.span,
+                        infer::LateBoundRegionConversionTime::FnCall,
+                        &fn_sig.output()).0;
                     self.require_type_is_sized_deferred(output, expr.span, traits::SizedReturnType);
                 }
 

src/librustdoc/html/static/rustdoc.css

@@ -283,7 +283,7 @@ nav.sub {
 	padding-left: 0;
 }
 
-:not(.source) .example-wrap {
+.rustdoc:not(.source) .example-wrap {
 	display: inline-flex;
 	margin-bottom: 10px;
 }
@@ -301,11 +301,11 @@ nav.sub {
 	text-align: right;
 }
 
-:not(.source) .example-wrap > pre.rust {
+.rustdoc:not(.source) .example-wrap > pre.rust {
 	width: 100%;
 }
 
-body:not(.source) .example-wrap > pre {
+.rustdoc:not(.source) .example-wrap > pre {
 	margin: 0;
 }
 

src/rustllvm/llvm-rebuild-trigger

@@ -1,4 +1,4 @@
 # If this file is modified, then llvm will be (optionally) cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2018-11-28
+2018-12-13

src/test/run-pass/issue-56237.rs

@@ -0,0 +1,11 @@
+use std::ops::Deref;
+
+fn foo<P>(_value: <P as Deref>::Target)
+where
+    P: Deref,
+    <P as Deref>::Target: Sized,
+{}
+
+fn main() {
+    foo::<Box<u32>>(2);
+}