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ICE using parenthetical trait notation in impls #19982

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nikomatsakis opened this issue Dec 18, 2014 · 1 comment
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ICE using parenthetical trait notation in impls #19982

nikomatsakis opened this issue Dec 18, 2014 · 1 comment
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I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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@nikomatsakis
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The following test will ICE:

#![feature(unboxed_closures)]
struct Foo;
impl Fn(&int) for Foo { }

The workaround for now is to write:

impl<'a> Fn(&'a int) for Foo { }

It would be better if this were implicit. This seems related to lifetime elision, which also is supposed to permit elided parameters in impls.
@aturon aturon mentioned this issue Dec 18, 2014
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nikomatsakis added a commit to nikomatsakis/rust that referenced this issue Dec 19, 2014
@nikomatsakis
Work around rust-lang#19982 by rewriting test impls to not use anonymous
d4f8a5a 
lifetimes. This currently causes an ICE; it should (ideally) work, but
failing that at least give a structured error. For the purposes of
this PR, though, workaround is fine.
This was referenced Dec 22, 2014
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@kmcallister kmcallister added the I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ label Jan 9, 2015
tamird added a commit to tamird/rust that referenced this issue Mar 16, 2015
@tamird
Regression test for rust-lang#19982
3a93bdb 
Closes rust-lang#17165, rust-lang#19982.
@tamird
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tamird commented Apr 21, 2015

Hey, this should have been closed by 3a93bdb! @steveklabnik would you mind?

@scottmcm scottmcm mentioned this issue Oct 8, 2018
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I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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@steveklabnik @nikomatsakis @kmcallister @tamird