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Combination of const generics, extra braces around a const generic parameter, and cross-crate use causes stack overflow #73120

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yvt opened this issue Jun 8, 2020 · 1 comment · Fixed by #74392
Closed

Combination of const generics, extra braces around a const generic parameter, and cross-crate use causes stack overflow #73120

yvt opened this issue Jun 8, 2020 · 1 comment · Fixed by #74392
Labels
A-const-generics Area: const generics (parameters and arguments) C-bug Category: This is a bug. F-const_generics `#![feature(const_generics)]` I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@yvt
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yvt commented Jun 8, 2020 •
edited
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Code

All files packaged in a single Gist: https://gist.github.com/yvt/2fec54f8012d512c59216b5d2ef82d63

lib1/src/lib.rs:

fn unused_function(_: <lib2::GenericType<42> as lib2::TypeFn>::Output) {}

lib2/src/lib.rs:

#![feature(const_generics)]

// All of these three items must be in `lib2` to reproduce the error

pub trait TypeFn {
    type Output;
}

pub struct GenericType<const B: i8>;

// Removing the braces around `42` resolves the crash
impl TypeFn for GenericType<{ 42 }> {
    type Output = ();
}

Meta

rustc --version --verbose:

$ rustc --version --verbose
rustc 1.46.0-nightly (0262de554 2020-06-07)
binary: rustc
commit-hash: 0262de554b4c4c5af346137bbb1664a3f6cf4df2
commit-date: 2020-06-07
host: x86_64-apple-darwin
release: 1.46.0-nightly
LLVM version: 10.0

Error output

$ cargo build -p lib1
   Compiling lib2 v0.1.0 (WORKSPACE_DIRECTORY/lib2)
warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
 --> lib2/src/lib.rs:1:12
  |
1 | #![feature(const_generics)]
  |            ^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

warning: unnecessary braces around const expression
  --> lib2/src/lib.rs:10:29
   |
10 | impl TypeFn for GenericType<{ 42 }> {
   |                             ^^^^^^ help: remove these braces
   |
   = note: `#[warn(unused_braces)]` on by default

   Compiling lib1 v0.1.0 (WORKSPACE_DIRECTORY/lib1)
warning: 2 warnings emitted


thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow
error: could not compile `lib1`.

Caused by:
  process didn't exit successfully: `rustc --crate-name lib1 --edition=2018 lib1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=ebc5fd98cbffda2d -C extra-filename=-ebc5fd98cbffda2d --out-dir WORKSPACE_DIRECTORY/target/debug/deps -C incremental=WORKSPACE_DIRECTORY/target/debug/incremental -L dependency=WORKSPACE_DIRECTORY/target/debug/deps --extern lib2=WORKSPACE_DIRECTORY/target/debug/deps/liblib2-493874d8e8624eee.rmeta -Ctarget-cpu=native` (signal: 6, SIGABRT: process abort signal)
Backtrace 

* thread #3, name = 'rustc', stop reason = EXC_BAD_ACCESS (code=2, address=0x70000bf08fd8)
    frame #0: 0x0000000104012a45 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_query_system::query::plumbing::get_query_impl::hd3f2c958d4983325 + 117
librustc_driver-554a90bb8f5bbcd2.dylib`rustc_query_system::query::plumbing::get_query_impl::hd3f2c958d4983325:
->  0x104012a45 <+117>: callq  0x1043d7c40               ; hashbrown::map::RawEntryBuilder$LT$K$C$V$C$S$GT$::from_key_hashed_nocheck::h1882771ccd1e27ac
    0x104012a4a <+122>: testq  %rax, %rax
    0x104012a4d <+125>: je     0x104012a9a               ; <+202>
    0x104012a4f <+127>: movq   (%rdx), %r13
Target 0: (rustc) stopped.
(lldb) bt
   ⋮
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    frame #33113: 0x0000000103ed9710 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_const::hf809661716f1acc1 + 624
    frame #33114: 0x0000000103ee3741 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 3585
    frame #33115: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33116: 0x0000000103ecc85e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::pretty::PrettyPrinter::pretty_print_type::h4387524258b381af + 3246
    frame #33117: 0x0000000103ee0014 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..pretty..PrettyPrinter$GT$::generic_delimiters::h6c7ec83bbc6cadbd + 196
    frame #33118: 0x0000000103ee334e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 2574
    frame #33119: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33120: 0x0000000103ee2dc2 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 1154
    frame #33121: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33122: 0x0000000103ed9710 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_const::hf809661716f1acc1 + 624
    frame #33123: 0x0000000103ee3741 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 3585
    frame #33124: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33125: 0x0000000103ecc85e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::pretty::PrettyPrinter::pretty_print_type::h4387524258b381af + 3246
    frame #33126: 0x0000000103ee0014 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..pretty..PrettyPrinter$GT$::generic_delimiters::h6c7ec83bbc6cadbd + 196
    frame #33127: 0x0000000103ee334e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 2574
    frame #33128: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33129: 0x0000000103ee2dc2 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 1154
    frame #33130: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33131: 0x0000000103ed9710 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_const::hf809661716f1acc1 + 624
    frame #33132: 0x0000000103ee3741 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 3585
    frame #33133: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33134: 0x0000000103ecc85e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::pretty::PrettyPrinter::pretty_print_type::h4387524258b381af + 3246
    frame #33135: 0x0000000103ee0014 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..pretty..PrettyPrinter$GT$::generic_delimiters::h6c7ec83bbc6cadbd + 196
    frame #33136: 0x0000000103ee334e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 2574
    frame #33137: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33138: 0x0000000103ee2dc2 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 1154
    frame #33139: 0x0000000103ed5f93 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_def_path::h07a91b6275da5c3d + 307
    frame #33140: 0x0000000103ed9710 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..Printer$GT$::print_const::hf809661716f1acc1 + 624
    frame #33141: 0x0000000103ee3741 librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 3585
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    frame #33143: 0x0000000103ecc85e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::pretty::PrettyPrinter::pretty_print_type::h4387524258b381af + 3246
    frame #33144: 0x0000000103ee0014 librustc_driver-554a90bb8f5bbcd2.dylib`_$LT$rustc_middle..ty..print..pretty..FmtPrinter$LT$F$GT$$u20$as$u20$rustc_middle..ty..print..pretty..PrettyPrinter$GT$::generic_delimiters::h6c7ec83bbc6cadbd + 196
    frame #33145: 0x0000000103ee334e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 2574
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    frame #33154: 0x0000000103ee334e librustc_driver-554a90bb8f5bbcd2.dylib`rustc_middle::ty::print::Printer::default_print_def_path::hb1c921ff5df1618c + 2574
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@yvt yvt 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 Jun 8, 2020
@yvt yvt changed the title Combination of const generics, extra braces around parameters, and cross-crate use causes stack overflow Combination of const generics, extra braces around a const generic parameter, and cross-crate use causes stack overflow Jun 8, 2020
@jonas-schievink jonas-schievink added A-const-generics Area: const generics (parameters and arguments) F-const_generics `#![feature(const_generics)]` I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. requires-nightly This issue requires a nightly compiler in some way. and removed I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ labels Jun 8, 2020
yvt added a commit to r3-os/r3 that referenced this issue Jun 8, 2020
@yvt
fix(utils): remove extra braces to work around a compiler bug
ac461cc 
This commit implements a work-around for this issue:
<rust-lang/rust#73120>
@lcnr
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lcnr commented Jun 9, 2020

This will probably get fixed by #72600

lcnr added a commit to lcnr/rust that referenced this issue Jul 16, 2020
@lcnr
add regression test for rust-lang#73120
946cb11
@lcnr lcnr mentioned this issue Jul 16, 2020
Merged
Manishearth added a commit to Manishearth/rust that referenced this issue Jul 16, 2020
@Manishearth
Rollup merge of rust-lang#74392 - lcnr:const-generics-update, r=varkor
658d5d0 
const generics triage

I went through all const generics issues and closed all issues which are already fixed.

Some issues already have a regression test but were not closed. Also doing this as part of this PR.

uff r? @eddyb @varkor

closes rust-lang#61936
closes rust-lang#62878
closes rust-lang#63695
closes rust-lang#67144
closes rust-lang#68596
closes rust-lang#69816
closes rust-lang#70217
closes rust-lang#70507
closes rust-lang#70586
closes rust-lang#71348
closes rust-lang#71805
closes rust-lang#73120
closes rust-lang#73508
closes rust-lang#73730
closes rust-lang#74255
@bors bors closed this as completed in c354524 Jul 16, 2020
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A-const-generics Area: const generics (parameters and arguments) C-bug Category: This is a bug. F-const_generics `#![feature(const_generics)]` I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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const generics triage lcnr/rust
3 participants
@jonas-schievink @yvt @lcnr