Complain about incorrect use of null-aware operations.

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

Index: pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
index 6a8cdc1df53ae4aa916a4cc7b621eb127f4acc4d..fb9368f94d94b52a476ca94643feec3eb751d00e 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -123,6 +123,24 @@ FastaMessage _formatFactoryNotSync(Uri uri, int charOffset) {
       arguments: {});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const FastaCode<_SuperNullAware> codeSuperNullAware =
+    const FastaCode<_SuperNullAware>("SuperNullAware",
+        template: r"'super' can't be null.",
+        tip: r"Try replacing '?.' with '.'",
+        dart2jsCode: "FASTA_IGNORED",
+        format: _formatSuperNullAware);
+
+typedef FastaMessage _SuperNullAware(Uri uri, int charOffset);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+FastaMessage _formatSuperNullAware(Uri uri, int charOffset) {
+  return new FastaMessage(uri, charOffset, codeSuperNullAware,
+      message: "'super' can't be null.",
+      tip: "Try replacing '?.' with '.'",
+      arguments: {});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const FastaCode<_PrivateNamedParameter> codePrivateNamedParameter =
     const FastaCode<_PrivateNamedParameter>("PrivateNamedParameter",