LLVM abort with indexing of byte string literal in static

[huonw]

#![allow(dead_code)]

const X: &'static [u8] = b"1";

static Y: u8 = X[0];

fn main() {}

rustc: /build/rust-git/src/rust/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::GlobalVariable; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type = llvm::GlobalVariable*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Aborted
playpen: application terminated with error code 134

Changing the b"1" to e.g. &[1] works fine.

[cristicbz]

Also stumbled upon this. A workaround is using the bytes macro: bytes!("1")[0]

[Sawyer47]

Current rust gives an error

5:20 error: cannot refer to other statics by value, use the address-of operator or a constant instead

[huonw]

Ah, thanks. It looks like this is still a problem after changing the static X to const Y.

[vadimcn]

Still seeing this, but bytes!() is gone now :(

[huonw]

This seems to be related to b"..." being a DST, that seemingly isn't being handled correctly, cc @nick29581. I think it would be fixed by #18465 but both @alexcrichton and I have met problems with implementing that.