Super weird parse error

[emberian]

struct Bar {
    x: int,
    y: uint
}

fn main() {
    let r = &mut Bar {
        x, 12,
        y: 32
    };
}

gives

foo.rs:7:21: 7:22 error: expected `;` but found `{`
foo.rs:7     let r = &mut Bar {
                              ^
task 'rustc' failed at 'explicit failure', /build/rust-git/src/rust/src/libsyntax/diagnostic.rs:75
task '<main>' failed at 'explicit failure', /build/rust-git/src/rust/src/librustc/lib.rs:396

cc @jbclements

[jbclements]

Looks to me like the parser sees the comma after the x and decides that the curly braces are part of a separate block, and that the semicolon is omitted. Changing the comma to a colon fixes the problem. I don't see a super-obvious fix for this.

[huonw]

Triage: still an issue (with &mut instead of @mut, updated code), although I idly wonder if #14885 helps (unfortunately that seems unlikely).

[jfager]

This seems to be better now:

$ rustc r10498.rs 
r10498.rs:8:10: 8:11 error: expected `:` but found `,`
r10498.rs:8         x, 12,

[steveklabnik]

Yup, can confirm.