Initial implementation for lazy compound assignment operators

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index 13e7b89620c4ff97579f37ebd22240d46fe09525..4ddfee51c4792a9fb3c93e8d0ec245ca95fb8b85 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -2669,12 +2669,12 @@ class DartDelta extends Delta {
     // We could just invalidate errors if we moved reporting of
     // HintCode.DEPRECATED_MEMBER_USE from resolver to verifier.
     for (String name in references.names) {
-        ClassElementDelta classDelta = changedClasses[name];
-        if (classDelta != null && classDelta.hasAnnotationChanges) {
-            _log(() => '$refLibrary is affected because '
-                '$name has a class delta with annotation changes');
-            return true;
-        }
+      ClassElementDelta classDelta = changedClasses[name];
+      if (classDelta != null && classDelta.hasAnnotationChanges) {
+        _log(() => '$refLibrary is affected because '
+            '$name has a class delta with annotation changes');
+        return true;
+      }
     }
     return false;
   }
@@ -4895,16 +4895,6 @@ class ReferencedNamesBuilder extends GeneralizingAstVisitor {
     }
   }
 
-  static String _getSimpleName(Identifier identifier) {
-    if (identifier is SimpleIdentifier) {
-      return identifier.name;
-    }
-    if (identifier is PrefixedIdentifier) {
-      return identifier.identifier.name;
-    }
-    return null;
-  }
-
   @override
   visitClassTypeAlias(ClassTypeAlias node) {
     ReferencedNamesScope outerScope = scope;
@@ -4934,14 +4924,6 @@ class ReferencedNamesBuilder extends GeneralizingAstVisitor {
   }
 
   @override
-  visitSuperConstructorInvocation(SuperConstructorInvocation node) {
-    if (node.constructorName == null && enclosingSuperClassName != null) {
-      names.extendedUsedUnnamedConstructorNames.add(enclosingSuperClassName);
-    }
-    super.visitSuperConstructorInvocation(node);
-  }
-
-  @override
   visitConstructorName(ConstructorName node) {
     if (node.parent is! ConstructorDeclaration) {
       super.visitConstructorName(node);
@@ -5061,6 +5043,14 @@ class ReferencedNamesBuilder extends GeneralizingAstVisitor {
   }
 
   @override
+  visitSuperConstructorInvocation(SuperConstructorInvocation node) {
+    if (node.constructorName == null && enclosingSuperClassName != null) {
+      names.extendedUsedUnnamedConstructorNames.add(enclosingSuperClassName);
+    }
+    super.visitSuperConstructorInvocation(node);
+  }
+
+  @override
   visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
     VariableDeclarationList variableList = node.variables;
     // Prepare type dependencies.
@@ -5092,6 +5082,16 @@ class ReferencedNamesBuilder extends GeneralizingAstVisitor {
   void _addSuperNames(String className, List<TypeName> types) {
     types?.forEach((type) => _addSuperName(className, type));
   }
+
+  static String _getSimpleName(Identifier identifier) {
+    if (identifier is SimpleIdentifier) {
+      return identifier.name;
+    }
+    if (identifier is PrefixedIdentifier) {
+      return identifier.identifier.name;
+    }
+    return null;
+  }
 }
 
 class ReferencedNamesScope {
@@ -6145,6 +6145,8 @@ class ScanDartTask extends SourceBasedAnalysisTask {
       scanner.setSourceStart(fragment.line, fragment.column);
       scanner.preserveComments = context.analysisOptions.preserveComments;
       scanner.scanGenericMethodComments = context.analysisOptions.strongMode;
+      scanner.scanLazyAssignmentOperators =
+          context.analysisOptions.enableLazyAssignmentOperators;
 
       LineInfo lineInfo = new LineInfo(scanner.lineStarts);
 
@@ -6160,6 +6162,8 @@ class ScanDartTask extends SourceBasedAnalysisTask {
           new Scanner(source, new CharSequenceReader(content), errorListener);
       scanner.preserveComments = context.analysisOptions.preserveComments;
       scanner.scanGenericMethodComments = context.analysisOptions.strongMode;
+      scanner.scanLazyAssignmentOperators =
+          context.analysisOptions.enableLazyAssignmentOperators;
 
       LineInfo lineInfo = new LineInfo(scanner.lineStarts);