Tests for -Z fuel=foo=n

src/librustc/session/mod.rs

@@ -531,7 +531,7 @@ impl Session {
                     println!("optimization-fuel-exhausted: {}", msg());
                     self.out_of_fuel.set(true);
                 }
-                else {
+                else if fuel > 0{
                     self.optimization_fuel_limit.set(fuel-1);
                 }
             }

src/test/run-pass/optimization-fuel-0.rs

@@ -0,0 +1,24 @@
+// Copyright 2012 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.
+
+#![crate_name="foo"]
+
+use std::mem::size_of;
+
+// compile-flags: -Z fuel=foo=0
+
+struct S1(u8, u16, u8);
+struct S2(u8, u16, u8);
+
+fn main() {
+    assert_eq!(size_of::<S1>(), 6);
+    assert_eq!(size_of::<S2>(), 6);
+}
+

src/test/run-pass/optimization-fuel-1.rs

@@ -0,0 +1,26 @@
+// Copyright 2012 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.
+
+#![crate_name="foo"]
+
+use std::mem::size_of;
+
+// compile-flags: -Z fuel=foo=1
+
+struct S1(u8, u16, u8);
+struct S2(u8, u16, u8);
+
+fn main() {
+    let optimized = (size_of::<S1>() == 4) as usize
+        +(size_of::<S2>() == 4) as usize;
+    assert_eq!(optimized, 1);
+}
+
+