[DAS] Fixes hover for try/catch error/stack

Fixes: #55907
Change-Id: I385483eaf5cba4fbac10b402cdb87ace51e9b020
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/456400
Commit-Queue: Samuel Rawlins <[email protected]>
Auto-Submit: Felipe Morschel <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: FMorschel

pkg/analysis_server/lib/src/computer/computer_hover.dart

@@ -46,6 +46,7 @@ class DartUnitHoverComputer {
     }
 
     if (node is CompilationUnitMember ||
+        node is CatchClauseParameter ||
         node is Expression ||
         node is FormalParameter ||
         node is MethodDeclaration ||
@@ -188,6 +189,7 @@ class DartUnitHoverComputer {
   /// Returns `null` if there is no valid entity for this hover.
   SyntacticEntity? _locationEntity(AstNode node) {
     return switch (node) {
+      CatchClauseParameter() => node.name,
       NamedCompilationUnitMember() => node.name,
       Expression() => node,
       ExtensionDeclaration() => node.name,

pkg/analysis_server/test/lsp/hover_test.dart

@@ -1244,6 +1244,34 @@ Declared in _package:test/main.dart_.''';
     await assertStringContents(content, equals(expected));
   }
 
+  Future<void> test_tryCatch_error() async {
+    var content = '''
+void foo() {
+  try {} on Exception catch ([!err^or!], stack) {}
+}
+''';
+    var expected = '''
+```dart
+Exception error
+```
+Type: `Exception`''';
+    await assertStringContents(content, equals(expected));
+  }
+
+  Future<void> test_tryCatch_stack() async {
+    var content = '''
+void foo() {
+  try {} on Exception catch (error, [!stac^k!]) {}
+}
+''';
+    var expected = '''
+```dart
+StackTrace stack
+```
+Type: `StackTrace`''';
+    await assertStringContents(content, equals(expected));
+  }
+
   Future<void> test_typeParameter() async {
     var content = '''
 class C<[!^T!]> {}