Support for 'unary-' in DeclarationResolver.

pkg/analyzer/test/generated/declaration_resolver_test.dart

Index: pkg/analyzer/test/generated/declaration_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/declaration_resolver_test.dart b/pkg/analyzer/test/generated/declaration_resolver_test.dart
index 8d6bf511fc570ee1cc35741982e42fa244e12a1b..0f1112d289686cec3456320a16a2663b1fac1e2c 100644
--- a/pkg/analyzer/test/generated/declaration_resolver_test.dart
+++ b/pkg/analyzer/test/generated/declaration_resolver_test.dart
@@ -314,6 +314,19 @@ main(List<String> items) {
     // no other validations than built into DeclarationResolver
   }
 
+  void test_visitMethodDeclaration_unaryMinus() {
+    String code = r'''
+class C {
+  C operator -() => null;
+  C operator -(C other) => null;
+}
+''';
+    CompilationUnit unit = resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
   void test_visitMethodDeclaration_getter_duplicate() {
     String code = r'''
 class C {