---

yaml
---
r: 135249
b: refs/heads/snap-stage3
c: 8a60952
h: refs/heads/master
i:
  135247: 6d73149
v: v3

Author: lilyball

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 74090504219e4e37c1a6d9fdd8600f44b51c7b04
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 976438f78fdce8092430f4c81ca272293c48f1a0
+refs/heads/snap-stage3: 8a609521007c0c0c37d8d2396085631c08ad5232
 refs/heads/try: 14378ea357c06c23607ca61ade44f60a7a64a1c7
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/doc/reference.md

@@ -2441,6 +2441,8 @@ The currently implemented features of the reference compiler are:
 * `default_type_params` - Allows use of default type parameters. The future of
                           this feature is uncertain.
 
+* `if_let` - Allows use of the `if let` desugaring syntax.
+
 * `intrinsics` - Allows use of the "rust-intrinsics" ABI. Compiler intrinsics
                  are inherently unstable and no promise about them is made.
 

branches/snap-stage3/src/doc/rust.md

@@ -1,3 +1,3 @@
 % The Rust Reference Manual
 
-The manual has moved, and is now called [the reference](reference.html).
+The manual has moved, and is now called [the reference](reference.html).

branches/snap-stage3/src/libsyntax/feature_gate.rs

@@ -71,6 +71,8 @@ static KNOWN_FEATURES: &'static [(&'static str, Status)] = &[
     ("associated_types", Active),
     ("visible_private_types", Active),
 
+    ("if_let", Active),
+
     // if you change this list without updating src/doc/rust.md, cmr will be sad
 
     // A temporary feature gate used to enable parser extensions needed
@@ -356,6 +358,10 @@ impl<'a, 'v> Visitor<'v> for Context<'a> {
                                   e.span,
                                   "tuple indexing is experimental");
             }
+            ast::ExprIfLet(..) => {
+                self.gate_feature("if_let", e.span,
+                                  "`if let` desugaring is experimental");
+            }
             _ => {}
         }
         visit::walk_expr(self, e);

branches/snap-stage3/src/test/compile-fail/if-let.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(macro_rules)]
+#![feature(macro_rules,if_let)]
 
 fn macros() {
     macro_rules! foo{

branches/snap-stage3/src/test/compile-fail/lint-unnecessary-parens.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![deny(unnecessary_parens)]
+#![feature(if_let)]
 
 #[deriving(Eq, PartialEq)]
 struct X { y: bool }

branches/snap-stage3/src/test/run-pass/if-let.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(if_let)]
+
 pub fn main() {
     let x = Some(3i);
     if let Some(y) = x {