Fix more of the Fasta tests

pkg/analyzer/lib/src/fasta/ast_builder.dart

Index: pkg/analyzer/lib/src/fasta/ast_builder.dart
diff --git a/pkg/analyzer/lib/src/fasta/ast_builder.dart b/pkg/analyzer/lib/src/fasta/ast_builder.dart
index 524b1fd7e6ed900ea9440fdbf68339721a90a2d0..6f7f95a97f69c147f2ee11a9bf26a21a1b8f60cf 100644
--- a/pkg/analyzer/lib/src/fasta/ast_builder.dart
+++ b/pkg/analyzer/lib/src/fasta/ast_builder.dart
@@ -986,13 +986,14 @@ class AstBuilder extends ScopeListener {
         stackTrace = catchParameters[1].identifier;
       }
     }
+    // TODO(brianwilkerson) The parser needs to pass in the comma token.
     push(ast.catchClause(
         onKeyword,
         type,
         catchKeyword,
         catchParameterList?.leftParenthesis,
         exception,
-        null,
+        stackTrace == null ? null : stackTrace.token.previous,
         stackTrace,
         catchParameterList?.rightParenthesis,
         body));