LLVM assert with owned closure returning closed-over value, "argument of incompatible type"

[bstrie]

Test case:

fn main() {
    let x = 2i;
    let _y = move || x;
}

Output:

rustc: /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::PointerType; Y = llvm::Type; typename llvm::cast_retty<X, Y*>::ret_type = llvm::PointerType*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Aborted

[japaric]

I think this is a duplicate of #19141, #20193 and #20228. See this #20193 (comment) for rationale.

As a workaround use move |:| instead of move ||.

[bstrie]

I'd say this is a dupe of #19141, yep. I'll close this one. Given that they're giving different error messages I'd say #20193 and #20228 are probably worth keeping open for the time being even though they're all likely caused by the same thing.