split test into failing and passing components

Author: yaahc

src/names/name-resolution.md

@@ -152,7 +152,7 @@ Names may not be resolved through ambiguous glob imports. Glob imports are allow
 
 For example:
 
-```rust
+```rust,compile_fail,E0659
 mod foo {
     pub struct Qux;
 }
@@ -165,10 +165,21 @@ use foo::*;
 use bar::*; // OK, no name conflict.
 
 fn ambiguous_use() {
-    // This would be an error, due to the ambiguity.
-    //let x = Qux;
+    let x = Qux; // ERROR: `Qux` is ambiguous
 }
+```
 
+```rust
+# mod foo {
+#     pub struct Qux;
+# }
+#
+# mod bar {
+#     pub struct Qux;
+# }
+#
+# use foo::*;
+# use bar::*; // OK, no name conflict.
 fn ambiguous_shadow() {
     // This is permitted, since resolution is not through the ambiguous globs.
     struct Qux;