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, 18 insertions, 18 deletions

diff --git a/src/libstd/num/mod.rs b/src/libstd/num/mod.rs
index 9aaaceb87e6..a568aafe1ed 100644
--- a/src/libstd/num/mod.rs
+++ b/src/libstd/num/mod.rs
@@ -161,7 +161,7 @@ mod tests {
     use u64;
     use uint;
 
-    macro_rules! test_cast_20(
+    macro_rules! test_cast_20 {
         ($_20:expr) => ({
             let _20 = $_20;
 
@@ -204,7 +204,7 @@ mod tests {
             assert_eq!(_20, cast(20f32).unwrap());
             assert_eq!(_20, cast(20f64).unwrap());
         })
-    )
+    }
 
     #[test] fn test_u8_cast()    { test_cast_20!(20u8)  }
     #[test] fn test_u16_cast()   { test_cast_20!(20u16) }
@@ -664,7 +664,7 @@ mod tests {
         assert_eq!(third.checked_mul(4), None);
     }
 
-    macro_rules! test_next_power_of_two(
+    macro_rules! test_next_power_of_two {
         ($test_name:ident, $T:ident) => (
             fn $test_name() {
                 #![test]
@@ -676,15 +676,15 @@ mod tests {
                 }
             }
         )
-    )
+    }
 
-    test_next_power_of_two!(test_next_power_of_two_u8, u8)
-    test_next_power_of_two!(test_next_power_of_two_u16, u16)
-    test_next_power_of_two!(test_next_power_of_two_u32, u32)
-    test_next_power_of_two!(test_next_power_of_two_u64, u64)
-    test_next_power_of_two!(test_next_power_of_two_uint, uint)
+    test_next_power_of_two! { test_next_power_of_two_u8, u8 }
+    test_next_power_of_two! { test_next_power_of_two_u16, u16 }
+    test_next_power_of_two! { test_next_power_of_two_u32, u32 }
+    test_next_power_of_two! { test_next_power_of_two_u64, u64 }
+    test_next_power_of_two! { test_next_power_of_two_uint, uint }
 
-    macro_rules! test_checked_next_power_of_two(
+    macro_rules! test_checked_next_power_of_two {
         ($test_name:ident, $T:ident) => (
             fn $test_name() {
                 #![test]
@@ -699,13 +699,13 @@ mod tests {
                 assert_eq!($T::MAX.checked_next_power_of_two(), None);
             }
         )
-    )
+    }
 
-    test_checked_next_power_of_two!(test_checked_next_power_of_two_u8, u8)
-    test_checked_next_power_of_two!(test_checked_next_power_of_two_u16, u16)
-    test_checked_next_power_of_two!(test_checked_next_power_of_two_u32, u32)
-    test_checked_next_power_of_two!(test_checked_next_power_of_two_u64, u64)
-    test_checked_next_power_of_two!(test_checked_next_power_of_two_uint, uint)
+    test_checked_next_power_of_two! { test_checked_next_power_of_two_u8, u8 }
+    test_checked_next_power_of_two! { test_checked_next_power_of_two_u16, u16 }
+    test_checked_next_power_of_two! { test_checked_next_power_of_two_u32, u32 }
+    test_checked_next_power_of_two! { test_checked_next_power_of_two_u64, u64 }
+    test_checked_next_power_of_two! { test_checked_next_power_of_two_uint, uint }
 
     #[deriving(PartialEq, Show)]
     struct Value { x: int }
@@ -759,13 +759,13 @@ mod tests {
             let one: T = Int::one();
             range(0, exp).fold(one, |acc, _| acc * base)
         }
-        macro_rules! assert_pow(
+        macro_rules! assert_pow {
             (($num:expr, $exp:expr) => $expected:expr) => {{
                 let result = $num.pow($exp);
                 assert_eq!(result, $expected);
                 assert_eq!(result, naive_pow($num, $exp));
             }}
-        )
+        }
         assert_pow!((3i,     0 ) => 1);
         assert_pow!((5i,     1 ) => 5);
         assert_pow!((-4i,    2 ) => 16);