Add missing ret statements to check_mod

Un-XFAIL compile-fail export tests

src/comp/middle/resolve.rs

@@ -382,6 +382,8 @@ fn lookup_name_wrapped(&env e, ast.ident i, namespace ns, direction dir)
                     case (ast.mie_item(?item)) {
                         if (visible(i, m, dir)) {
                             ret some(found_def_item(item, ns));
+                        } else {
+                            ret none[def_wrap];
                         }
                     }
                     case (ast.mie_tag_variant(?item, ?variant_idx)) {
@@ -391,6 +393,8 @@ fn lookup_name_wrapped(&env e, ast.ident i, namespace ns, direction dir)
                                     auto vid = variants.(variant_idx).node.id;
                                     auto t = ast.def_variant(tid, vid);
                                     ret some[def_wrap](def_wrap_other(t));
+                                } else {
+                                    ret none[def_wrap];
                                 }
                             }
                             case (_) {

src/test/compile-fail/export-fully-qualified.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 
 // In this test baz isn't resolved when called as foo.baz even though

src/test/compile-fail/export-import.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 
 import m.unexported;

src/test/compile-fail/export-no-tag-variants.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 
 // Tag variants are not exported with their tags. This allows for a

src/test/compile-fail/export-tag-variant.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 
 mod foo {

src/test/compile-fail/export.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 mod foo {
   export x;

src/test/compile-fail/export2.rs

@@ -1,7 +1,5 @@
 // xfail-boot
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: unresolved name
 
 mod foo {