fix negative trait bound in outline view (#14044)

Author: gftea

crates/ide/src/file_structure.rs

@@ -160,7 +160,10 @@ fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
                 let label = match target_trait {
                     None => format!("impl {}", target_type.syntax().text()),
                     Some(t) => {
-                        format!("impl {} for {}", t.syntax().text(), target_type.syntax().text(),)
+                        format!("impl {}{} for {}", 
+                        it.excl_token().map(|x| x.to_string()).unwrap_or_default(), 
+                        t.syntax().text(), 
+                        target_type.syntax().text(),)
                     }
                 };
 
@@ -213,6 +216,26 @@ mod tests {
         expect.assert_debug_eq(&structure)
     }
 
+    #[test]
+    fn test_nagative_trait_bound() {
+        let txt = r#"impl !Unpin for Test {}"#;
+        check(txt, expect![[r#"
+        [
+            StructureNode {
+                parent: None,
+                label: "impl !Unpin for Test",
+                navigation_range: 16..20,
+                node_range: 0..23,
+                kind: SymbolKind(
+                    Impl,
+                ),
+                detail: None,
+                deprecated: false,
+            },
+        ]
+        "#]]);
+    } 
+
     #[test]
     fn test_file_structure() {
         check(