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ICE with #![feature(existential_type)] + closure #58951

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#63158
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ICE with #![feature(existential_type)] + closure#58951
#63158
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A-closuresArea: Closures (`|…| { … }`)A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.A-type-systemArea: Type systemE-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]`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.requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.
@Centril

Description

@Centril
Centril
opened on Mar 5, 2019

Encountered this when working on test cases for an RFC:

#![feature(existential_type)]

existential type A: Iterator;
fn def_a() -> A { 0..1 }
pub fn use_a() {
    def_a().map(|x| x);
}

cc @oli-obk

This seems related to other issues.

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    A-closuresArea: Closures (`|…| { … }`)A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.A-type-systemArea: Type systemE-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]`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.requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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