---

yaml
---
r: 188319
b: refs/heads/master
c: 280dea7
h: refs/heads/master
i:
  188317: d2a55c0
  188315: 6f19bb8
  188311: f31f80b
  188303: 66e68eb
  188287: 787ea4e
v: v3

Author: Aatch

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 1246d4067fdc034d064dfb78f88c2c3c079c3f4f
+refs/heads/master: 280dea743b5227d0d162217cbb89db881242c94e
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 3a96d6a9818fe2affc98a187fb1065120458cee9
 refs/heads/try: 649d35e4d830b27806705dc5352c86ab6d6fd1a1

trunk/src/librustc/session/config.rs

@@ -348,7 +348,8 @@ macro_rules! options {
     #[allow(non_upper_case_globals, dead_code)]
     mod $mod_desc {
         pub const parse_bool: Option<&'static str> = None;
-        pub const parse_opt_bool: Option<&'static str> = None;
+        pub const parse_opt_bool: Option<&'static str> =
+            Some("one of: `y`, `yes`, `on`, `n`, `no`, or `off`");
         pub const parse_string: Option<&'static str> = Some("a string");
         pub const parse_opt_string: Option<&'static str> = Some("a string");
         pub const parse_list: Option<&'static str> = Some("a space-separated list of strings");
@@ -379,7 +380,19 @@ macro_rules! options {
 
         fn parse_opt_bool(slot: &mut Option<bool>, v: Option<&str>) -> bool {
             match v {
-                Some(..) => false,
+                Some(s) => {
+                    match s {
+                        "n" | "no" | "off" => {
+                            *slot = Some(false);
+                        }
+                        "y" | "yes" | "on" => {
+                            *slot = Some(true);
+                        }
+                        _ => { return false; }
+                    }
+
+                    true
+                },
                 None => { *slot = Some(true); true }
             }
         }