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, 10 insertions, 10 deletions

diff --git a/src/test/debuginfo/lexical-scope-with-macro.rs b/src/test/debuginfo/lexical-scope-with-macro.rs
index 5a59ed5b2f3..2c76f2ca7df 100644
--- a/src/test/debuginfo/lexical-scope-with-macro.rs
+++ b/src/test/debuginfo/lexical-scope-with-macro.rs
@@ -113,23 +113,23 @@
 
 #![feature(macro_rules)]
 
-macro_rules! trivial(
+macro_rules! trivial {
     ($e1:expr) => ($e1)
-)
+}
 
-macro_rules! no_new_scope(
+macro_rules! no_new_scope {
     ($e1:expr) => (($e1 + 2) - 1)
-)
+}
 
-macro_rules! new_scope(
+macro_rules! new_scope {
     () => ({
         let a = 890242i;
         zzz(); // #break
         sentinel();
     })
-)
+}
 
-macro_rules! shadow_within_macro(
+macro_rules! shadow_within_macro {
     ($e1:expr) => ({
         let a = $e1 + 2;
 
@@ -141,12 +141,12 @@ macro_rules! shadow_within_macro(
         zzz(); // #break
         sentinel();
     })
-)
+}
 
 
-macro_rules! dup_expr(
+macro_rules! dup_expr {
     ($e1:expr) => (($e1) + ($e1))
-)
+}
 
 
 fn main() {