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internal compiler error: Error constructed but not emitted #62546

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#62604
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internal compiler error: Error constructed but not emitted#62546
#62604
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estebank
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A-parserArea: The lexing & parsing of Rust source code to an ASTE-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcI-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️P-highHigh priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.

Description

@dwrensha
dwrensha
opened on Jul 9, 2019

I see the following error on the beta and nightly channels, but not on stable:

$ echo "pub t(#" > main.rs

$ rustc main.rs
error: this file contains an un-closed delimiter
 --> main.rs:1:9
  |
1 | pub t(#
  |      -  ^
  |      |
  |      un-closed delimiter

error: internal compiler error: Error constructed but not emitted

thread 'rustc' panicked at 'explicit panic', src/librustc_errors/diagnostic_builder.rs:387:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
error: aborting due to 2 previous errors


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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.37.0-beta.2 (74e5a0d47 2019-07-08) running on x86_64-apple-darwin

Found with the help of libfuzzer-sys.

Activity

  1. Centril
    added
    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    A-parserArea: The lexing & parsing of Rust source code to an AST
    regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.
    regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
    on Jul 9, 2019
  2. pnkfelix
    added
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    on Jul 11, 2019

  3. pnkfelix commented on Jul 11, 2019

    @pnkfelix
    pnkfelix
    on Jul 11, 2019
    Contributor

    triage: P-high, because errors being swallowed, even in the presence of other errors, scares me a bit.

  4. pnkfelix
    added
    P-highHigh priority
    on Jul 11, 2019

  5. nikomatsakis commented on Jul 11, 2019

    @nikomatsakis
    nikomatsakis
    on Jul 11, 2019
    Contributor

    Perhaps @estebank might be a good candidate to investigate?

  6. estebank
    self-assigned this
    on Jul 11, 2019

  7. estebank commented on Jul 11, 2019

    @estebank
    estebank
    on Jul 11, 2019
    Contributor

    The error that is not being emitted is

    error: expected `[`, found `)`
 --> file7.rs:1:8
  |
1 | pub t(#
  |        ^ expected `[`

    Looking. Found, incoming PR shortly.

  8. estebank
    removed
    regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.
    on Jul 13, 2019
  9. Centril
    added a commit that references this issue on Jul 13, 2019

    Rollup merge of rust-lang#62604 - estebank:unemitted-err-ice, r=pnkfelix

    4fe6e63
  10. bors
    closed this as completedin #62604on Jul 13, 2019
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A-parserArea: The lexing & parsing of Rust source code to an ASTE-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcI-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️P-highHigh priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.

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