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ICE when calling syn::parse_macro_input! in proc macro applied to a function with a doc comment in a declarative macro #81007

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DimiDimit opened this issue Jan 14, 2021 · 0 comments · Fixed by #81177
Closed

ICE when calling syn::parse_macro_input! in proc macro applied to a function with a doc comment in a declarative macro #81007

DimiDimit opened this issue Jan 14, 2021 · 0 comments · Fixed by #81177
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@Aaron1011
Labels
A-proc-macros Area: Procedural macros C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@DimiDimit
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Code

macro_rules! test_fixtures {
    ($($item:item)*) => {
        $(
            #[async_std::test] // This serves the role of calling syn::parse_macro_input!
            $item
        )*
    }
}

test_fixtures! {
    // Normal comments work fine.
    /// Doc comments cause a panic.
    async fn test() {
        eprintln!("Hello world!");
    }
}

Meta

rustc --version --verbose:
To get this output I compiled commit rustc on commit c7b0ddb, because the binaries don't show anything useful.

rustc 1.51.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.51.0-dev

Error output

thread 'rustc' panicked at 'internal error: entered unreachable code', compiler/rustc_expand/src/proc_macro_server.rs:193:20
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.51.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C linker=/usr/bin/clang -C incremental -C link-arg=-fuse-ld=lld --crate-type lib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: custom attribute panicked
  --> src/tests.rs:4:13
   |
4  |               #[async_std::test] // This serves the role of calling syn::parse_macro_input!
   |               ^^^^^^^^^^^^^^^^^^
...
10 | / test_fixtures! {
11 | |     // Normal comments work fine.
12 | |     /// Doc comments cause a panic.
13 | |     async fn test() {
14 | |         eprintln!("Hello world!");
15 | |     }
16 | | }
   | |_- in this macro invocation
   |
   = help: message: internal error: entered unreachable code
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
Backtrace 

thread 'rustc' panicked at 'internal error: entered unreachable code', compiler/rustc_expand/src/proc_macro_server.rs:193:20
stack backtrace:
   0: rust_begin_unwind
             at /tmp/rust/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /tmp/rust/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /tmp/rust/library/core/src/panicking.rs:50:5
   3: <proc_macro::bridge::TokenTree<rustc_expand::proc_macro_server::Group,rustc_expand::proc_macro_server::Punct,rustc_expand::proc_macro_server::Ident,rustc_expand::proc_macro_server::Literal> as rustc_expand::proc_macro_server::FromInternal<((rustc_ast::tokenstream::TokenTree,rustc_ast::tokenstream::Spacing),&rustc_session::parse::ParseSess,&mut alloc::vec::Vec<proc_macro::bridge::TokenTree<rustc_expand::proc_macro_server::Group,rustc_expand::proc_macro_server::Punct,rustc_expand::proc_macro_server::Ident,rustc_expand::proc_macro_server::Literal>>)>>::from_internal
             at /tmp/rust/compiler/rustc_expand/src/proc_macro_server.rs:193:20
   4: <rustc_expand::proc_macro_server::Rustc as proc_macro::bridge::server::TokenStreamIter>::next::{{closure}}
             at /tmp/rust/compiler/rustc_expand/src/proc_macro_server.rs:449:22
   5: core::option::Option<T>::or_else
             at /tmp/rust/library/core/src/option.rs:784:21
   6: <rustc_expand::proc_macro_server::Rustc as proc_macro::bridge::server::TokenStreamIter>::next
             at /tmp/rust/compiler/rustc_expand/src/proc_macro_server.rs:447:24
   7: <proc_macro::bridge::server::MarkedTypes<S> as proc_macro::bridge::server::TokenStreamIter>::next
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:72:34
   8: <proc_macro::bridge::server::Dispatcher<proc_macro::bridge::server::MarkedTypes<S>> as proc_macro::bridge::server::DispatcherTrait>::dispatch::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:106:33
   9: core::ops::function::FnOnce::call_once
             at /tmp/rust/library/core/src/ops/function.rs:227:5
  10: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /tmp/rust/library/std/src/panic.rs:322:9
  11: std::panicking::try::do_call
             at /tmp/rust/library/std/src/panicking.rs:379:40
  12: std::panicking::try
             at /tmp/rust/library/std/src/panicking.rs:343:19
  13: std::panic::catch_unwind
             at /tmp/rust/library/std/src/panic.rs:396:14
  14: <proc_macro::bridge::server::Dispatcher<proc_macro::bridge::server::MarkedTypes<S>> as proc_macro::bridge::server::DispatcherTrait>::dispatch
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:115:33
  15: <proc_macro::bridge::server::SameThread as proc_macro::bridge::server::ExecutionStrategy>::run_bridge_and_client::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:153:32
  16: <proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
             at /tmp/rust/library/proc_macro/src/bridge/closure.rs:19:13
  17: proc_macro::bridge::closure::Closure<A,R>::call
             at /tmp/rust/library/proc_macro/src/bridge/closure.rs:27:18
  18: proc_macro::bridge::client::TokenStreamIter::next::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:244:25
  19: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:336:47
  20: proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:293:17
  21: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /tmp/rust/library/proc_macro/src/bridge/scoped_cell.rs:75:9
  22: proc_macro::bridge::client::BridgeState::with::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:291:13
  23: std::thread::local::LocalKey<T>::try_with
             at /tmp/rust/library/std/src/thread/local.rs:272:16
  24: std::thread::local::LocalKey<T>::with
             at /tmp/rust/library/std/src/thread/local.rs:248:9
  25: proc_macro::bridge::client::BridgeState::with
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:290:9
  26: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:329:9
  27: proc_macro::bridge::client::TokenStreamIter::next
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:237:17
  28: <proc_macro::token_stream::IntoIter as core::iter::traits::iterator::Iterator>::next
             at /tmp/rust/library/proc_macro/src/lib.rs:240:13
  29: <proc_macro2::imp::TokenTreeIter as core::iter::traits::iterator::Iterator>::next
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/wrapper.rs:304:46
  30: <proc_macro2::token_stream::IntoIter as core::iter::traits::iterator::Iterator>::next
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/lib.rs:1213:13
  31: syn::buffer::TokenBuffer::inner_new
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.58/src/buffer.rs:53:19
  32: syn::buffer::TokenBuffer::new2
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.58/src/buffer.rs:112:9
  33: <F as syn::parse::Parser>::parse2
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.58/src/parse.rs:1207:19
  34: syn::parse::Parser::parse
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.58/src/parse.rs:1161:9
  35: syn::parse_macro_input::parse
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.58/src/parse_macro_input.rs:139:5
  36: async_attributes::test
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/async-attributes-1.1.1/src/lib.rs:99:17
  37: core::ops::function::FnOnce::call_once
             at /tmp/rust/library/core/src/ops/function.rs:227:5
  38: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream,proc_macro::TokenStream) .> proc_macro::TokenStream>::expand2::run::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:426:17
  39: proc_macro::bridge::client::run_client::{{closure}}::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:377:26
  40: proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/scoped_cell.rs:80:33
  41: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /tmp/rust/library/proc_macro/src/bridge/scoped_cell.rs:75:9
  42: proc_macro::bridge::scoped_cell::ScopedCell<T>::set
             at /tmp/rust/library/proc_macro/src/bridge/scoped_cell.rs:80:9
  43: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:325:35
  44: std::thread::local::LocalKey<T>::try_with
             at /tmp/rust/library/std/src/thread/local.rs:272:16
  45: std::thread::local::LocalKey<T>::with
             at /tmp/rust/library/std/src/thread/local.rs:248:9
  46: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:325:9
  47: proc_macro::bridge::client::run_client::{{closure}}
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:370:9
  48: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /tmp/rust/library/std/src/panic.rs:322:9
  49: std::panicking::try::do_call
             at /tmp/rust/library/std/src/panicking.rs:379:40
  50: __rust_try
  51: std::panicking::try
             at /tmp/rust/library/std/src/panicking.rs:343:19
  52: std::panic::catch_unwind
             at /tmp/rust/library/std/src/panic.rs:396:14
  53: proc_macro::bridge::client::run_client
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:369:5
  54: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream,proc_macro::TokenStream) .> proc_macro::TokenStream>::expand2::run
             at /tmp/rust/library/proc_macro/src/bridge/client.rs:425:13
  55: <proc_macro::bridge::server::SameThread as proc_macro::bridge::server::ExecutionStrategy>::run_bridge_and_client
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:155:9
  56: proc_macro::bridge::server::run_server
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:291:9
  57: proc_macro::bridge::server::<impl proc_macro::bridge::client::Client<fn(proc_macro::TokenStream,proc_macro::TokenStream) .> proc_macro::TokenStream>>::run
             at /tmp/rust/library/proc_macro/src/bridge/server.rs:334:9
  58: <rustc_expand::proc_macro::AttrProcMacro as rustc_expand::base::AttrProcMacro>::expand
             at /tmp/rust/compiler/rustc_expand/src/proc_macro.rs:53:9
  59: rustc_expand::expand::MacroExpander::expand_invoc
             at /tmp/rust/compiler/rustc_expand/src/expand.rs:753:44
  60: rustc_expand::expand::MacroExpander::fully_expand_fragment
             at /tmp/rust/compiler/rustc_expand/src/expand.rs:497:53
  61: rustc_expand::expand::MacroExpander::expand_crate
             at /tmp/rust/compiler/rustc_expand/src/expand.rs:390:15
  62: rustc_interface::passes::configure_and_expand_inner::{{closure}}::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/passes.rs:302:50
  63: rustc_data_structures::profiling::VerboseTimingGuard::run
             at /tmp/rust/compiler/rustc_data_structures/src/profiling.rs:570:9
  64: rustc_session::utils::<impl rustc_session::session::Session>::time
             at /tmp/rust/compiler/rustc_session/src/utils.rs:9:9
  65: rustc_interface::passes::configure_and_expand_inner::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/passes.rs:302:21
  66: rustc_data_structures::profiling::VerboseTimingGuard::run
             at /tmp/rust/compiler/rustc_data_structures/src/profiling.rs:570:9
  67: rustc_session::utils::<impl rustc_session::session::Session>::time
             at /tmp/rust/compiler/rustc_session/src/utils.rs:9:9
  68: rustc_interface::passes::configure_and_expand_inner
             at /tmp/rust/compiler/rustc_interface/src/passes.rs:254:13
  69: rustc_interface::passes::configure_and_expand::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/passes.rs:118:19
  70: alloc::boxed::<impl core::ops::generator::Generator<R> for core::pin::Pin<alloc::boxed::Box<G,A>>>::resume
             at /tmp/rust/library/alloc/src/boxed.rs:1606:9
  71: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
             at /tmp/rust/compiler/rustc_data_structures/src/box_region.rs:44:26
  72: rustc_interface::passes::BoxedResolver::new
             at /tmp/rust/compiler/rustc_data_structures/src/box_region.rs:101:41
  73: rustc_interface::passes::configure_and_expand
             at /tmp/rust/compiler/rustc_interface/src/passes.rs:114:30
  74: rustc_interface::queries::Queries::expansion::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/queries.rs:180:13
  75: rustc_interface::queries::Query<T>::compute
             at /tmp/rust/compiler/rustc_interface/src/queries.rs:39:28
  76: rustc_interface::queries::Queries::expansion
             at /tmp/rust/compiler/rustc_interface/src/queries.rs:176:9
  77: rustc_driver::run_compiler::{{closure}}::{{closure}}
             at /tmp/rust/compiler/rustc_driver/src/lib.rs:393:13
  78: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
             at /tmp/rust/compiler/rustc_interface/src/queries.rs:418:19
  79: rustc_driver::run_compiler::{{closure}}
             at /tmp/rust/compiler/rustc_driver/src/lib.rs:341:22
  80: rustc_interface::interface::create_compiler_and_run::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/interface.rs:197:13
  81: rustc_span::with_source_map
             at /tmp/rust/compiler/rustc_span/src/lib.rs:787:5
  82: rustc_interface::interface::create_compiler_and_run
             at /tmp/rust/compiler/rustc_interface/src/interface.rs:191:5
  83: rustc_interface::interface::run_compiler::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/interface.rs:213:12
  84: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/util.rs:152:13
  85: scoped_tls::ScopedKey<T>::set
             at /home/dimitar/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137:9
  86: rustc_span::with_session_globals
             at /tmp/rust/compiler/rustc_span/src/lib.rs:103:5
  87: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/util.rs:150:9
  88: rustc_interface::util::scoped_thread::{{closure}}
             at /tmp/rust/compiler/rustc_interface/src/util.rs:125:24
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Was rmanoka/async-scoped#6 but we narrowed it down to rustc.
This only occurs on any rustc version after commit 6184f23, which merges #80830.
@DimiDimit DimiDimit added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 14, 2021
@DimiDimit DimiDimit changed the title ICE when calling syn::parse_macro_input! in proc macro decorating a function with a doc comment in a declarative macro ICE when calling syn::parse_macro_input! in proc macro applied to a function with a doc comment in a declarative macro Jan 14, 2021
@DimiDimit DimiDimit mentioned this issue Jan 14, 2021
Closed
@Aaron1011 Aaron1011 added the A-proc-macros Area: Procedural macros label Jan 14, 2021
@Aaron1011 Aaron1011 self-assigned this Jan 14, 2021
@Aaron1011 Aaron1011 mentioned this issue Jan 15, 2021
Closed
Aaron1011 added a commit to Aaron1011/rust that referenced this issue Jan 15, 2021
@Aaron1011
Always collect tokens when we are already inside a collect_tokens call
372b567 
Fixes rust-lang#81007

This is needed to ensure that the `LazyTokenStream` we use does not
include attributes - the outer call may include the attributes, which we
don't want to include in the `LazyTokenSTream`.
taiki-e added a commit to taiki-e/auto_enums that referenced this issue Jan 16, 2021
@taiki-e
Temporarily disable test that ICE occurred
8b465b0 
Refs: rust-lang/rust#81007
@Aaron1011 Aaron1011 mentioned this issue Jan 18, 2021
Merged
@Aaron1011 Aaron1011 mentioned this issue Jan 18, 2021
Merged
Aaron1011 added a commit to Aaron1011/rust that referenced this issue Jan 22, 2021
@Aaron1011
Force token collection to run when parsing nonterminals
b2e55bf 
Fixes rust-lang#81007

Previously, we would fail to collect tokens in the proper place when
only builtin attributes were present. As a result, we would end up with
attribute tokens in the collected `TokenStream`, leading to duplication
when we attempted to prepend the attributes from the AST node.

We now explicitly track when token collection must be performed due to
nomterminal parsing.
bors added a commit to rust-lang-ci/rust that referenced this issue Jan 22, 2021
@bors
Auto merge of rust-lang#81177 - Aaron1011:fix/force-capture-tokens, r…
dc1eee2 
…=petrochenkov

Force token collection to run when parsing nonterminals

Fixes rust-lang#81007

Previously, we would fail to collect tokens in the proper place when
only builtin attributes were present. As a result, we would end up with
attribute tokens in the collected `TokenStream`, leading to duplication
when we attempted to prepend the attributes from the AST node.

We now explicitly track when token collection must be performed due to
nomterminal parsing.
@bors bors closed this as completed in 11b1e37 Jan 22, 2021
flip1995 pushed a commit to flip1995/rust that referenced this issue Jan 30, 2021
@Aaron1011
Force token collection to run when parsing nonterminals
2be935d 
Fixes rust-lang#81007

Previously, we would fail to collect tokens in the proper place when
only builtin attributes were present. As a result, we would end up with
attribute tokens in the collected `TokenStream`, leading to duplication
when we attempted to prepend the attributes from the AST node.

We now explicitly track when token collection must be performed due to
nomterminal parsing.
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@Aaron1011 Aaron1011

Labels
A-proc-macros Area: Procedural macros C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@Aaron1011 @DimiDimit