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'rustc' has overflowed its stack error #39639

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J-F-Liu opened this issue Feb 8, 2017 · 2 comments
Closed

'rustc' has overflowed its stack error #39639

J-F-Liu opened this issue Feb 8, 2017 · 2 comments
Labels
A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@J-F-Liu
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J-F-Liu commented Feb 8, 2017

I see this error also reported in other issues, but I think the cause is different. Here is my example code:

#![feature(conservative_impl_trait)]

trait Trait {
    fn method(&self, x: i32) -> i32;
}

impl<F> Trait for F
    where F: Fn(i32) -> i32
{
    fn method(&self, x: i32) -> i32 {
        if x > 0 { self(x - 1) } else { 0 }
    }
}

fn call<T: Trait, F: Fn() -> T>(f: F) -> impl Trait {
    move |x: i32| f().method(x)
}

fn expr() -> impl Trait {
    call(expr)
    // move |x: i32| expr().method(x)
}

fn main() {
    println!("{:?}", expr().method(2));
}
rustc 1.17.0-nightly (ea7a6486a 2017-02-04)

thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow

If you uncomment move || expr().method() and comment call(expr) build can success.

@bstrie bstrie added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. B-unstable Blocker: Implemented in the nightly compiler and unstable. and removed B-unstable Blocker: Implemented in the nightly compiler and unstable. labels Mar 27, 2017
@cyplo
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cyplo commented Jun 30, 2017

still happening now with rustc 1.20.0-nightly (f590a44 2017-06-27)

@Mark-Simulacrum Mark-Simulacrum added the A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. label Jul 19, 2017
@Mark-Simulacrum Mark-Simulacrum added the C-bug Category: This is a bug. label Jul 27, 2017
@cramertj
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cramertj commented Jan 5, 2018

Dup of #39555 and #38064

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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-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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