34   void Visit(Expression* expr);
52   void Visit(IdentifierExpression* expr);
53   void Visit(NumberLiteralExpression* expr) {}  in Visit()  argument
54   void Visit(StringLiteralExpression* expr) {}  in Visit()  argument
55   void Visit(CallExpression* expr);
56   void Visit(ElementAccessExpression* expr) {  in Visit()  argument
57     Visit(expr->array);  in Visit()
58     Visit(expr->index);  in Visit()
60   void Visit(FieldAccessExpression* expr) { Visit(expr->object); }  in Visit()  argument
61   void Visit(BlockStatement* expr) {  in Visit()  argument
62     Declarations::NodeScopeActivator scope(declarations(), expr);  in Visit()
63     for (Statement* stmt : expr->statements) Visit(stmt);  in Visit()
115   void Visit(LogicalOrExpression* expr);
116   void Visit(LogicalAndExpression* expr);
119   void Visit(ConditionalExpression* expr);
124   void Visit(AssignmentExpression* expr) {  in Visit()  argument
125     MarkLocationModified(expr->location);  in Visit()
126     Visit(expr->location);  in Visit()
127     Visit(expr->value);  in Visit()
132   void Visit(GotoStatement* expr) {}  in Visit()  argument
135   void Visit(IncrementDecrementExpression* expr) {  in Visit()  argument
136     MarkLocationModified(expr->location);  in Visit()
137     Visit(expr->location);  in Visit()
140   void Visit(AssumeTypeImpossibleExpression* expr) { Visit(expr->expression); }  in Visit()  argument