rustc: Strip cnames before generating glue to avoid duplicates

Author: pcwalton

src/comp/middle/trans.rs

@@ -1370,9 +1370,11 @@ fn get_derived_tydesc(&@block_ctxt cx, &ty::t t, bool escapes,
     ret rslt(cx, v);
 }
 
-fn get_tydesc(&@block_ctxt cx, &ty::t t, bool escapes,
+fn get_tydesc(&@block_ctxt cx, &ty::t orig_t, bool escapes,
               &mutable option::t[@tydesc_info] static_ti) -> result {
 
+    auto t = ty::strip_cname(cx.fcx.lcx.ccx.tcx, orig_t);
+
     // Is the supplied type a type param? If so, return the passed-in tydesc.
     alt (ty::type_param(cx.fcx.lcx.ccx.tcx, t)) {
         case (some(?id)) { ret rslt(cx, cx.fcx.lltydescs.(id)); }
@@ -1390,8 +1392,10 @@ fn get_tydesc(&@block_ctxt cx, &ty::t t, bool escapes,
     ret rslt(cx, info.tydesc);
 }
 
-fn get_static_tydesc(&@block_ctxt cx, &ty::t t, &uint[] ty_params)
+fn get_static_tydesc(&@block_ctxt cx, &ty::t orig_t, &uint[] ty_params)
         -> @tydesc_info {
+    auto t = ty::strip_cname(cx.fcx.lcx.ccx.tcx, orig_t);
+
     alt (cx.fcx.lcx.ccx.tydescs.find(t)) {
         case (some(?info)) { ret info; }
         case (none) {

src/comp/middle/ty.rs

@@ -108,6 +108,7 @@ export sequence_is_interior;
 export struct;
 export sort_methods;
 export stmt_node_id;
+export strip_cname;
 export sty;
 export substitute_type_params;
 export t;
@@ -855,10 +856,14 @@ fn fold_ty(&ctxt cx, fold_mode fld, t ty_0) -> t {
 
 
 // Type utilities
+
 fn rename(&ctxt cx, t typ, str new_cname) -> t {
     ret gen_ty_full(cx, struct(cx, typ), some[str](new_cname));
 }
 
+fn strip_cname(&ctxt cx, t typ) -> t {
+    ret gen_ty_full(cx, struct(cx, typ), none);
+}
 
 // Returns a type with the structural part taken from `struct_ty` and the
 // canonical name from `cname_ty`.