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ICE: ty_is_local invoked on unexpected type: [type error] implementing trait for undeclared type #30589

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Ms2ger opened this issue Dec 28, 2015 · 0 comments · Fixed by #30676
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ICE: ty_is_local invoked on unexpected type: [type error] implementing trait for undeclared type #30589

Ms2ger opened this issue Dec 28, 2015 · 0 comments · Fixed by #30676
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I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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@Ms2ger
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Ms2ger commented Dec 28, 2015 

use std::fmt;

impl fmt::Display for DecoderError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Missing data: {}", self.0)
    }
}
fn main() {
}
/tmp/y:3:23: 3:35 error: use of undeclared type name `DecoderError` [E0412]
/tmp/y:3 impl fmt::Display for DecoderError {
                               ^~~~~~~~~~~~
/tmp/y:3:23: 3:35 help: run `rustc --explain E0412` to see a detailed explanation
error: internal compiler error: ty_is_local invoked on unexpected type: [type error]
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: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'Box<Any>', ../src/libsyntax/errors/mod.rs:230
@apasel422 apasel422 added the I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ label Dec 28, 2015
@sanxiyn sanxiyn mentioned this issue Dec 29, 2015
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@nikomatsakis nikomatsakis mentioned this issue Jan 2, 2016
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nikomatsakis added a commit to nikomatsakis/rust that referenced this issue Jan 9, 2016
@nikomatsakis
Make coherence more tolerant of error types.
b4f5ddb 
Fixes rust-lang#29857.
Fixes rust-lang#30589.
bors added a commit that referenced this issue Jan 11, 2016
@bors
Auto merge of #30676 - nikomatsakis:issue-29857, r=arielb1
d01ed8a 
This is an alternative to #29954 for fixing #29857 that seems to me to be more inline with the general strategy around `TyError`. It also includes the fix for #30589 -- in fact, just the minimal change of making `ty_is_local` tolerate `TyError` avoids the ICE, but you get a lot of duplicate error reports, so in the case where the impl's trait reference already includes `TyError`, we just ignore the impl altogether.

cc @arielb1 @sanxiyn

Fixes #29857.
Fixes #30589.
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I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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Make coherence more tolerant of error types. nikomatsakis/rust
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@Ms2ger @apasel422