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, 1 insertions, 1 deletions

diff --git a/src/test/bench/core-std.rs b/src/test/bench/core-std.rs
index 6e2cd508291..16129593485 100644
--- a/src/test/bench/core-std.rs
+++ b/src/test/bench/core-std.rs
@@ -31,7 +31,7 @@ fn main() {
         ($id:ident) =>
             (maybe_run_test(argv.as_slice(),
                             stringify!($id).to_string(),
-                            $id)))
+                            $id)));
 
     bench!(shift_push);
     bench!(read_line);