issues with stmt arguments to macros

[comex]

I'm not exactly sure what it's supposed to do, but it seems wrong:

#![feature(macro_rules)]
macro_rules! some_stmts(
    ({ $($s:stmt)* }) => ($($s)*)
)

fn main() {
    some_stmts!({
        //let a = 5;
        type a = int;
    })
}

As is, we get:

stmts.rs:10:5: 10:6 error: local ambiguity: multiple parsing options: built-in NTs stmt ('s') or 1 other options.
stmts.rs:10     })

even though there is no way } could start a statement. With the let instead, it's

stmts.rs:8:18: 8:19 error: unexpected token: `;`
stmts.rs:8         let a = 5;

which doesn't seem to make sense either.

rustc 0.11-pre-nightly (d35804e 2014-04-18 00:01:22 -0700)

[lifthrasiir]

Duplicate of #3232. The local ambiguity is caused by two states corresponding to { $( · $s:stmt )* } and { $( $s:stmt )* · } respectively, where the former is not really possible with the lookahead of } but the macro parser does not know that fact.

[alexcrichton]

Closing as a dupe (as noted by @lifthrasiir)