Issue 23010. Compute constant and report related errors during incremental resolution.

pkg/analyzer/test/generated/incremental_resolver_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.incremental_resolver_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 2792 matching lines @@
   void foo2() {}
 }
 ''');
   }
 
   void setUp() {
     super.setUp();
     _resetWithIncremental(true);
   }
 
+  void test_computeConstants() {
+    _resolveUnit(r'''
+int f() => 0;
+main() {
+  const x = f();
+  print(x + 1);
+}
+''');
+    _updateAndValidate(r'''
+int f() => 0;
+main() {
+  const x = f();
+  print(x + 2);
+}
+''');
+  }
+
   void test_dartDoc_beforeField() {
     _resolveUnit(r'''
 class A {
   /**
    * A field [field] of type [int] in class [A].
    */
   int field;
 }
 ''');
     _updateAndValidate(r'''
@@ skipping 1176 matching lines @@
     return ResolutionContextBuilder.contextFor(node, listener).scope;
   }
 }
 
 class _Edit {
   final int offset;
   final int length;
   final String replacement;
   _Edit(this.offset, this.length, this.replacement);
 }