Fix for issue rust-lang#4547

Author: alexcrichton

src/rt/rust_task.cpp

@@ -124,7 +124,9 @@ cleanup_task(cleanup_args *args) {
         // assert(task->task_local_data != NULL);
         task->task_local_data_cleanup(task->task_local_data);
         task->task_local_data = NULL;
-    } else if (threw_exception && task->id == INIT_TASK_ID) {
+    }
+
+    if (threw_exception && task->id == INIT_TASK_ID) {
         // Edge case: If main never spawns any tasks, but fails anyway, TLS
         // won't be around to take down the kernel (task.rs:kill_taskgroup,
         // rust_task_kill_all). Do it here instead.

src/test/run-fail/issue-4547.rs

@@ -0,0 +1,18 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//error-pattern:explicit failure
+
+// Regression test for issue 4547
+
+pub fn main() {
+  os::args();
+  fail!();
+}