static call to invalid vtable

[alexcrichton]

Discovered this ICE in the rollup that I'm preparing:

fn main() {
    let a: &fmt::Show = &1i;     
    format!("{:?}", a);
}

error: internal compiler error: static call to invalid vtable: VtableObject(VtableObject(object_ty=core::fmt::Show + 'static))
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'Box<Any>', /home/alex/code/rust2/src/libsyntax/diagnostic.rs:182

[mzabaluev]

In Grust, I tried to change this line to:

        AsyncClosure::invoke(self.closure, args)

The crate compiles without an issue, but compiling another crate where this is used results in an ICE that looks to be this one.

[nikomatsakis]

Looks like I missed a case in #20341

[nikomatsakis]

Nominating for 1.0 beta.

[shepmaster]

Are there any known workarounds for this problem? I ran into this in a hard way trying to update to the newest nightlies.

[nikomatsakis]

@shepmaster not sure, I'll try to get a PR up today

[nikomatsakis]

@shepmaster a new type wrapper around the Show object would probably work, ping me on irc (nmatsakis) for more details

[outersky]

I just wanna run iron example on MAC 10.10 with rust-nightly, the same error occurs, I don't know if it's of the same case:

error: internal compiler error: static call to invalid vtable: VtableObject(VtableObject(object_ty=error::Error + 'static))