C++: code completion for lambda calls

support for lambdas, e.g.:
struct S { int bar; };
[]() { return new S; } ()->bar;
[] { return new S; } ()->bar;
[]() ->S* { return new S(); } ()->bar;
[]() throw() { return new S(); } ()->bar;
[]() throw()->S* { return new S(); } ()->bar;

Task-number: QTCREATORBUG-9523
Change-Id: I43fbf6f0ee0bb11411c53c984df75ef33a276466
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/libs/cplusplus/ResolveExpression.cpp

@@ -366,6 +366,18 @@ bool ResolveExpression::visit(CompoundExpressionAST *ast)
     return false;
 }
 
+bool ResolveExpression::visit(LambdaExpressionAST *ast)
+{
+    accept(ast->statement);
+    return false;
+}
+
+bool ResolveExpression::visit(ReturnStatementAST *ast)
+{
+    accept(ast->expression);
+    return false;
+}
+
 bool ResolveExpression::visit(NestedExpressionAST *ast)
 {
     accept(ast->expression);
@@ -626,6 +638,11 @@ bool ResolveExpression::visit(CallAST *ast)
 {
     const QList<LookupItem> baseResults = resolve(ast->base_expression, _scope);
 
+    if (ast->base_expression->asLambdaExpression()) {
+        _results = baseResults;
+        return false;
+    }
+
     // Compute the types of the actual arguments.
     unsigned actualArgumentCount = 0;