Fix encoding of trait static method paths. Closes #4097. r=pcwalton

src/librustc/metadata/encoder.rs

@@ -768,6 +768,7 @@ fn add_to_index_(item: @item, ebml_w: writer::Serializer,
         for traits.each |associated_trait| {
            encode_trait_ref(ebml_w, ecx, *associated_trait)
         }
+
         ebml_w.end_tag();
 
         // Now, output all of the static methods as items.  Note that for the
@@ -789,7 +790,9 @@ fn add_to_index_(item: @item, ebml_w: writer::Serializer,
             let polyty = ecx.tcx.tcache.get(local_def(ty_m.id));
             encode_ty_type_param_bounds(ebml_w, ecx, polyty.bounds);
             encode_type(ecx, ebml_w, polyty.ty);
-            encode_path(ecx, ebml_w, path, ast_map::path_name(ty_m.ident));
+            let m_path = vec::append_one(path,
+                                         ast_map::path_name(item.ident));
+            encode_path(ecx, ebml_w, m_path, ast_map::path_name(ty_m.ident));
             ebml_w.end_tag();
         }
 

src/test/auxiliary/static_fn_trait_xc_aux.rs

+pub mod num {
+    pub trait Num2 {
+        static pure fn from_int2(n: int) -> self;
+    }
+}
+
+pub mod float {
+    impl float: num::Num2 {
+        static pure fn from_int2(n: int) -> float { return n as float;  }
+    }
+}
\ No newline at end of file

src/test/run-pass/static-fn-trait-xc.rs

+// aux-build:static_fn_trait_xc_aux.rs
+
+extern mod mycore(name ="static_fn_trait_xc_aux");
+
+use mycore::num;
+
+fn main() {
+    let _1:float = num::from_int2(1i);
+}