Patch more metadata decoding problems.

Author: nikomatsakis

src/librustc/metadata/decoder.rs

@@ -172,14 +172,15 @@ fn item_visibility(item: rbml::Doc) -> ast::Visibility {
 }
 
 fn item_sort(item: rbml::Doc) -> char {
-    // NB(pcwalton): The default of 'r' here is relied upon in
-    // `is_associated_type` below.
-    let mut ret = 'r';
+    let mut ret = None;
     reader::tagged_docs(item, tag_item_trait_item_sort, |doc| {
-        ret = doc.as_str_slice().as_bytes()[0] as char;
+        ret = Some(doc.as_str_slice().as_bytes()[0] as char);
         false
     });
-    ret
+    match ret {
+        Some(r) => r,
+        None => panic!("No item_sort found")
+    }
 }
 
 fn item_symbol(item: rbml::Doc) -> String {

src/librustc/metadata/encoder.rs

@@ -898,7 +898,7 @@ fn encode_info_for_associated_type(ecx: &EncodeContext,
     encode_visibility(rbml_w, associated_type.vis);
     encode_family(rbml_w, 'y');
     encode_parent_item(rbml_w, local_def(parent_id));
-    encode_item_sort(rbml_w, 'r');
+    encode_item_sort(rbml_w, 't');
 
     let stab = stability::lookup(ecx.tcx, associated_type.def_id);
     encode_stability(rbml_w, stab);
@@ -1404,6 +1404,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
                     encode_path(rbml_w,
                                 path.clone().chain(Some(elem).into_iter()));
 
+                    encode_item_sort(rbml_w, 't');
                     encode_family(rbml_w, 'y');
 
                     is_nonstatic_method = false;