Seemingly bogus "unsupported constant expr"

[simias]

The following code builds and runs fine:

struct S(i32);

static S0: S = S(0);

fn main() {
    let d = S0;

    println!("{}",
             match d {
                 S(0) => true,
                 _  => false,
             });
}

However attempting to match 'd' against 'S0' produces an error at the declaration of S0:

struct S(i32);

static S0: S = S(0);

fn main() {
    let d = S0;

    println!("{}",
             match d {
                 S0 => true,
                 _  => false,
             });
}

test.rs:3:16: 3:20 error: unsupported constant expr
test.rs:3 static S0: S = S(0);
                         ^~~~

[ghost]

Duplicate of #6533 (and #13626 and #13731, really).

[simias]

Thanks for the pointers, I'm closing then.

[ghost]

Thanks for the bug report! I have a plan on how to address this, probably this week.