librust: Remove unnecessary workaround. Closes #7617

src/librust/rust.rs

@@ -60,13 +60,7 @@ struct Command<'self> {
     usage_full: UsageSource<'self>,
 }
 
-static NUM_OF_COMMANDS: uint = 7;
-
-// FIXME(#7617): should just be &'static [Command<'static>]
-// but mac os doesn't seem to like that and tries to loop
-// past the end of COMMANDS in usage thus passing garbage
-// to str::repeat and eventually malloc and crashing.
-static COMMANDS: [Command<'static>, .. NUM_OF_COMMANDS] = [
+static COMMANDS: &'static [Command<'static>] = &'static [
     Command {
         cmd: "build",
         action: CallMain("rustc", rustc::main_args),