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]

src/librustdoc/html/format.rs

@@ -779,7 +779,7 @@ The counts do not include methods or trait
 implementations that are visible only through a re-exported type.",
 stable, unstable, experimental, deprecated, unmarked,
 name=self.name));
-        try!(write!(f, "<table>"))
+        try!(write!(f, "<table>"));
         try!(fmt_inner(f, &mut context, self));
         write!(f, "</table>")
     }

src/librustdoc/html/markdown.rs

@@ -149,12 +149,12 @@ fn stripped_filtered_line<'a>(s: &'a str) -> Option<&'a str> {
 
 thread_local!(static USED_HEADER_MAP: RefCell<HashMap<String, uint>> = {
     RefCell::new(HashMap::new())
-})
-thread_local!(static TEST_IDX: Cell<uint> = Cell::new(0))
+});
+thread_local!(static TEST_IDX: Cell<uint> = Cell::new(0));
 
 thread_local!(pub static PLAYGROUND_KRATE: RefCell<Option<Option<String>>> = {
     RefCell::new(None)
-})
+});
 
 pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
     extern fn block(ob: *mut hoedown_buffer, orig_text: *const hoedown_buffer,

src/librustdoc/html/render.rs

@@ -246,9 +246,9 @@ struct IndexItem {
 
 // TLS keys used to carry information around during rendering.
 
-thread_local!(static CACHE_KEY: RefCell<Arc<Cache>> = Default::default())
+thread_local!(static CACHE_KEY: RefCell<Arc<Cache>> = Default::default());
 thread_local!(pub static CURRENT_LOCATION_KEY: RefCell<Vec<String>> =
-                    RefCell::new(Vec::new()))
+                    RefCell::new(Vec::new()));
 
 /// Generates the documentation for `crate` into the directory `dst`
 pub fn run(mut krate: clean::Crate,