librustc: Always parse `macro!()`/`macro![]` as expressions if not

followed by a semicolon.

This allows code like `vec![1i, 2, 3].len();` to work.

This breaks code that uses macros as statements without putting
semicolons after them, such as:

    fn main() {
        ...
        assert!(a == b)
        assert!(c == d)
        println(...);
    }

It also breaks code that uses macros as items without semicolons:

    local_data_key!(foo)

    fn main() {
        println("hello world")
    }

Add semicolons to fix this code. Those two examples can be fixed as
follows:

    fn main() {
        ...
        assert!(a == b);
        assert!(c == d);
        println(...);
    }

    local_data_key!(foo);

    fn main() {
        println("hello world")
    }

RFC #378.

Closes #18635.

[breaking-change]

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libcore/num/uint_macros.rs b/src/libcore/num/uint_macros.rs
index 2a94f851646..d79cf20fdfa 100644
--- a/src/libcore/num/uint_macros.rs
+++ b/src/libcore/num/uint_macros.rs
@@ -11,7 +11,7 @@
 #![macro_escape]
 #![doc(hidden)]
 
-macro_rules! uint_module (($T:ty, $T_SIGNED:ty, $bits:expr) => (
+macro_rules! uint_module { ($T:ty, $T_SIGNED:ty, $bits:expr) => (
 
 #[unstable]
 pub const BITS : uint = $bits;
@@ -23,4 +23,5 @@ pub const MIN: $T = 0 as $T;
 #[unstable]
 pub const MAX: $T = 0 as $T - 1 as $T;
 
-))
+) }
+