Fix missing case in resolve, un-XFAIL rec-tup.rs.

src/Makefile

@@ -542,6 +542,7 @@ TEST_XFAILS_SELF := $(filter-out \
                         multiline-comment.rs \
                         readalias.rs \
                         rec.rs \
+                        rec-tup.rs \
                         return-nil.rs \
                         tup.rs \
                         u32-decr.rs \

src/comp/middle/resolve.rs

@@ -105,6 +105,7 @@ fn lookup_name(&env e, ast.ident i) -> option.t[def] {
                     case (ast.item_mod(_, ?m, _)) {
                         ret check_mod(i, m);
                     }
+                    case (_) { /* fall through */ }
                 }
             }