Compiler crash pattern matching unsized tuple in enum variant · Issue #37685 · rust-lang/rust (original) (raw)

I was trying to get an enum which owns some String or Vec<u8> be able to deref into an unsized enum whose variants have str or [u8] but this appears to be unsupported at the moment.

But I am persistent so I try to make the variants hold refs to their original owners but one of them is a tuple.

I found plenty of issues where tuples are also not allowed to have their tail unsized (which seems odd as tuple structs are perfectly fine having their last member unsized) but I tried it anyway in the context of an enum variant tuple.

I tried this code: playground

enum FooRef<'a> {
    A(&'a (str,))
}

fn foo(f: FooRef) {
    match f {
        FooRef::A(&(ref s,)) => (),
    }
}

fn main() {}

I expected to see this happen: A sane error about tuples not being allowed to have an unsized tail.

Instead, this happened: mysterious exit (error: Could not compile ... without any further explanation) with error code 3221225477. On the playground this results in Segmentation fault (core dumped).

As I wrote this I found out that the above example only breaks in Debug builds, Release builds print Program ended. on any Rust version on the playground.

Compiler crash pattern matching unsized tuple in enum variant · Issue #37685 · rust-lang/rust (original) (raw)

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