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ICE: escaping regions in predicate Obligation(...) #43718

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Manishearth opened this issue Aug 7, 2017 · 2 comments
Closed

ICE: escaping regions in predicate Obligation(...) #43718

Manishearth opened this issue Aug 7, 2017 · 2 comments
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A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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@Manishearth
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Manishearth commented Aug 7, 2017

#![feature(conservative_impl_trait)]


fn iter_values(a: &[u32]) -> impl Iterator<Item=&u32>{
    a.iter().map(|a| &a)
}

(playpen )

throws

   Compiling playground v0.0.1 (file:///playground)
error: internal compiler error: /checkout/src/librustc_typeck/check/mod.rs:618: escaping regions in predicate Obligation(predicate=Binder(ProjectionPredicate(ProjectionTy { substs: Slice([_]), item_def_id: DefId { krate: CrateNum(2), node: DefIndex(1591) => core/e78183f::iter[0]::iterator[0]::Iterator[0]::Item[0] } }, &u32)),depth=0)
  --> src/main.rs:21:30
   |
21 |     fn iter_values(&self) -> impl Iterator<Item=&u32>{
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^

note: the compiler unexpectedly panicked. this is a bug.
@Manishearth
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Manishearth commented Aug 7, 2017

cc @petrochenkov @eddyb

@Manishearth Manishearth added A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ labels Aug 7, 2017
@Mark-Simulacrum Mark-Simulacrum added the C-bug Category: This is a bug. label Aug 10, 2017
@kennytm
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kennytm commented Aug 20, 2017

Duplicate of #42479

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Labels
A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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