ICE while translating unsupported cast

fn main() {
   enum Foo { F1 }
   let foo : *const Foo = F1 as *const Foo;
}

 $ rustc foo.rs 
foo.rs:4:9: 4:12 warning: unused variable: `foo`, #[warn(unused_variable)] on by default
foo.rs:4     let foo : *const Foo = F1 as *const Foo;
                 ^~~
error: internal compiler error: translating unsupported cast: main::Foo (cast_enum) -> *const main::Foo (cast_pointer)
note: the compiler hit an unexpected failure path. 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
task 'rustc' failed at 'Box<Any>', /var/tmp/portage/dev-lang/rust-9999-r2/work/rust-9999/src/libsyntax/diagnostic.rs:169

rust version: 1fb838d99

[mahkoh]

Not quite a dupe but related to #17458.

[mahkoh]

Actually this is #17444

But in #17444 bug is in:
libsyntax/ast_util.rs:776
while here it's in:
libsyntax/diagnostic.rs:169
I'm not sure they're the same
Yeah, they're the same

[mahkoh]

Both fail to compile here.

[bkoropoff]

This bug is a dupe of #17444 and can be closed

[alexcrichton]

Thanks @bkoropoff!