2 files changed, 13 insertions, 6 deletions
diff --git a/src/libstd/sys/windows/os.rs b/src/libstd/sys/windows/os.rs
index 7e684c52341..502d70d4e1a 100644
--- a/src/libstd/sys/windows/os.rs
+++ b/src/libstd/sys/windows/os.rs
@@ -18,7 +18,7 @@ use os::windows::*;
 use error::Error as StdError;
 use ffi::{OsString, OsStr, AsOsStr};
 use fmt;
-use iter::Range;
+use ops::Range;
 use libc::types::os::arch::extra::LPWCH;
 use libc::{self, c_int, c_void};
 use mem;
@@ -303,6 +303,10 @@ impl Iterator for Args {
     fn size_hint(&self) -> (usize, Option<usize>) { self.range.size_hint() }
 }
 
+impl ExactSizeIterator for Args {
+    fn len(&self) -> usize { self.range.len() }
+}
+
 impl Drop for Args {
     fn drop(&mut self) {
         unsafe { c::LocalFree(self.cur as *mut c_void); }
@@ -315,7 +319,7 @@ pub fn args() -> Args {
         let lpCmdLine = c::GetCommandLineW();
         let szArgList = c::CommandLineToArgvW(lpCmdLine, &mut nArgs);
 
-        Args { cur: szArgList, range: range(0, nArgs as isize) }
+        Args { cur: szArgList, range: 0..(nArgs as isize) }
     }
 }
 
diff --git a/src/libstd/sys/windows/thread.rs b/src/libstd/sys/windows/thread.rs
index a38dc9b2d34..f3a27877e5c 100644
--- a/src/libstd/sys/windows/thread.rs
+++ b/src/libstd/sys/windows/thread.rs
@@ -8,8 +8,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use boxed::Box;
+use prelude::v1::*;
+
 use cmp;
+use io;
 use mem;
 use ptr;
 use libc;
@@ -42,7 +44,7 @@ pub mod guard {
     }
 }
 
-pub unsafe fn create(stack: uint, p: Thunk) -> rust_thread {
+pub unsafe fn create(stack: uint, p: Thunk) -> io::Result<rust_thread> {
     let arg: *mut libc::c_void = mem::transmute(box p);
     // FIXME On UNIX, we guard against stack sizes that are too small but
     // that's because pthreads enforces that stacks are at least
@@ -60,9 +62,10 @@ pub unsafe fn create(stack: uint, p: Thunk) -> rust_thread {
     if ret as uint == 0 {
         // be sure to not leak the closure
         let _p: Box<Thunk> = mem::transmute(arg);
-        panic!("failed to spawn native thread: {:?}", ret);
+        Err(io::Error::last_os_error())
+    } else {
+        Ok(ret)
     }
-    return ret;
 }
 
 pub unsafe fn set_name(_name: &str) {