Minor fallout/update FOLLOW sets

src/libcore/macros.rs

@@ -186,12 +186,12 @@ macro_rules! write {
 #[macro_export]
 #[stable]
 macro_rules! writeln {
-    ($dst:expr, $fmt:expr, $($arg:tt)*) => (
-        write!($dst, concat!($fmt, "\n") $($arg)*)
-    );
     ($dst:expr, $fmt:expr) => (
         write!($dst, concat!($fmt, "\n"))
-    )
+    );
+    ($dst:expr, $fmt:expr, $($arg:expr),*) => (
+        write!($dst, concat!($fmt, "\n"), $($arg,)*)
+    );
 }
 
 /// A utility macro for indicating unreachable code.

src/libstd/rt/macros.rs

@@ -14,16 +14,24 @@
 //! they aren't defined anywhere outside of the `rt` module.
 
 macro_rules! rterrln {
-    ($fmt:expr $($arg:tt)*) => ( {
-        ::rt::util::dumb_print(format_args!(concat!($fmt, "\n") $($arg)*))
+    ($fmt:expr) => ( {
+        ::rt::util::dumb_print(format_args!(concat!($fmt, "\n")))
+    } );
+    ($fmt:expr, $($arg:expr),*) => ( {
+        ::rt::util::dumb_print(format_args!(concat!($fmt, "\n"), $($arg)*))
     } )
 }
 
 // Some basic logging. Enabled by passing `--cfg rtdebug` to the libstd build.
 macro_rules! rtdebug {
-    ($($arg:tt)*) => ( {
+    ($arg:expr) => ( {
         if cfg!(rtdebug) {
-            rterrln!($($arg)*)
+            rterrln!($arg)
+        }
+    } );
+    ($str:expr, $($arg:expr),*) => ( {
+        if cfg!(rtdebug) {
+            rterrln!($str, $($arg)*)
         }
     })
 }

src/libsyntax/ext/tt/macro_rules.rs

@@ -422,7 +422,7 @@ fn is_in_follow(cx: &ExtCtxt, tok: &Token, frag: &str) -> bool {
         },
         "stmt" | "expr"  => {
             match *tok {
-                Comma | Semi => true,
+                FatArrow | Comma | Semi => true,
                 _ => false
             }
         },
@@ -434,7 +434,7 @@ fn is_in_follow(cx: &ExtCtxt, tok: &Token, frag: &str) -> bool {
         },
         "path" | "ty" => {
             match *tok {
-                Comma | RArrow | Colon | Eq | Gt => true,
+                Comma | FatArrow | Colon | Eq | Gt => true,
                 Ident(i, _) if i.as_str() == "as" => true,
                 _ => false
             }