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Region#subst ICE: trait A<'self, T> { fn f() -> &'self T;} #5518

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nielsle opened this issue Mar 23, 2013 · 5 comments
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Region#subst ICE: trait A<'self, T> { fn f() -> &'self T;} #5518

nielsle opened this issue Mar 23, 2013 · 5 comments
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A-typesystem Area: The type system E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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@nielsle
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nielsle commented Mar 23, 2013

The following program causes a compiler error

#[crate_type = "lib"];
trait A<'self, T> { fn f() -> &'self T;}

$ rustc --version
/home/niels/local/src/rust/x86_64-unknown-linux-gnu/stage2/bin/rustc 0.6 (28efc23 2013-03-22 23:09:15 -0700)

$ rustc tests.rs
error: internal compiler error: ty::subst: Reference to self region when given substs with no self region, ty = &'self 'a

@graydon
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graydon commented May 8, 2013

reproduced today. seems relatively minor, though real: should be caught earlier.

@emberian
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emberian commented Jul 1, 2013

reproduces, error: internal compiler error: ty::Region#subst(): Reference to self region when given substs with no self region: substs(self_r=None, self_ty=Some(U), tps=[T])

@bblum
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bblum commented Aug 16, 2013

Doesn't need the crate type lib. Definitely should just be an error.

@sruggier
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I just hit this yesterday. Using commit 433fbe8 (August 13th), the following program:

#[crate_type = "lib"];

trait A<'self, T> {
    fn f(&mut self) -> &'self mut T;
    fn p() -> T;
}

triggers the same ICE:

error: internal compiler error: ty::Region#subst(): Reference to self region when given substs with no self region: substs(regions=[], self_ty=Some(BUG[1]), tps=[T])

However, if either of those two functions is removed, the remaining code compiles successfully. I realize this is a bit of a different problem than the original report. I can open a new issue, if that's preferred.

@flaper87
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'self is no longer a special lifetime. This can't be reproduced using a normal lifetime:

#[crate_type = "lib"];

trait A<'a, T> {
    fn f(&mut self) -> &'a mut T;
    fn p() -> T;
}

This probably needs a test. Flagging.

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Labels
A-typesystem Area: The type system E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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6 participants