---

yaml
---
r: 193478
b: refs/heads/beta
c: 10426f6
h: refs/heads/master
v: v3

Author: huonw

[refs]

@@ -31,7 +31,7 @@ refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/issue-18208-method-dispatch-3-quick-reject: 2009f85b9f99dedcec4404418eda9ddba90258a2
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: ab7ef7402bfab1c767b8be80f7e46947494f6d21
+refs/heads/beta: 10426f69dac38186c7bb8946743023729d65e1e6
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: de8a23bbc3a7b9cbd7574b5b91a34af59bf030e6

branches/beta/src/libsyntax/feature_gate.rs

@@ -285,7 +285,7 @@ pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
     ("recursion_limit", CrateLevel),
 ];
 
-#[derive(PartialEq, Copy)]
+#[derive(PartialEq, Copy, Debug)]
 pub enum AttributeType {
     /// Normal, builtin attribute that is consumed
     /// by the compiler before the unused_attribute check
@@ -353,7 +353,9 @@ struct Context<'a> {
 
 impl<'a> Context<'a> {
     fn gate_feature(&self, feature: &str, span: Span, explain: &str) {
-        if !self.has_feature(feature) {
+        let has_feature = self.has_feature(feature);
+        debug!("gate_feature(feature = {:?}, span = {:?}); has? {}", feature, span, has_feature);
+        if !has_feature {
             emit_feature_err(self.span_handler, feature, span, explain);
         }
     }
@@ -634,12 +636,14 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
     }
 
     fn visit_attribute(&mut self, attr: &ast::Attribute) {
+        debug!("visit_attribute(attr = {:?})", attr);
         let name = &*attr.name();
         for &(n, ty) in KNOWN_ATTRIBUTES {
             if n == name {
                 if let Gated(gate, desc) = ty {
                     self.gate_feature(gate, attr.span, desc);
                 }
+                debug!("visit_attribute: {:?} is known, {:?}", name, ty);
                 return;
             }
         }