GDScript: Remove error when coroutine is called without await

In the case the call happens as a statement, since the return value
isn't used in this case.

modules/gdscript/gdscript_analyzer.cpp

@@ -1069,7 +1069,7 @@ void GDScriptAnalyzer::resolve_node(GDScriptParser::Node *p_node) {
 		case GDScriptParser::Node::SUBSCRIPT:
 		case GDScriptParser::Node::TERNARY_OPERATOR:
 		case GDScriptParser::Node::UNARY_OPERATOR:
-			reduce_expression(static_cast<GDScriptParser::ExpressionNode *>(p_node));
+			reduce_expression(static_cast<GDScriptParser::ExpressionNode *>(p_node), true);
 			break;
 		case GDScriptParser::Node::BREAK:
 		case GDScriptParser::Node::BREAKPOINT:
@@ -1658,7 +1658,7 @@ void GDScriptAnalyzer::resolve_return(GDScriptParser::ReturnNode *p_return) {
 	p_return->set_datatype(result);
 }
 
-void GDScriptAnalyzer::reduce_expression(GDScriptParser::ExpressionNode *p_expression) {
+void GDScriptAnalyzer::reduce_expression(GDScriptParser::ExpressionNode *p_expression, bool p_is_root) {
 	// This one makes some magic happen.
 
 	if (p_expression == nullptr) {
@@ -1686,7 +1686,7 @@ void GDScriptAnalyzer::reduce_expression(GDScriptParser::ExpressionNode *p_expre
 			reduce_binary_op(static_cast<GDScriptParser::BinaryOpNode *>(p_expression));
 			break;
 		case GDScriptParser::Node::CALL:
-			reduce_call(static_cast<GDScriptParser::CallNode *>(p_expression));
+			reduce_call(static_cast<GDScriptParser::CallNode *>(p_expression), p_is_root);
 			break;
 		case GDScriptParser::Node::CAST:
 			reduce_cast(static_cast<GDScriptParser::CastNode *>(p_expression));
@@ -2056,7 +2056,7 @@ void GDScriptAnalyzer::reduce_binary_op(GDScriptParser::BinaryOpNode *p_binary_o
 	p_binary_op->set_datatype(result);
 }
 
-void GDScriptAnalyzer::reduce_call(GDScriptParser::CallNode *p_call, bool is_await) {
+void GDScriptAnalyzer::reduce_call(GDScriptParser::CallNode *p_call, bool p_is_await, bool p_is_root) {
 	bool all_is_constant = true;
 	Map<int, GDScriptParser::ArrayNode *> arrays; // For array literal to potentially type when passing.
 	for (int i = 0; i < p_call->arguments.size(); i++) {
@@ -2415,7 +2415,7 @@ void GDScriptAnalyzer::reduce_call(GDScriptParser::CallNode *p_call, bool is_awa
 		}
 	}
 
-	if (call_type.is_coroutine && !is_await) {
+	if (call_type.is_coroutine && !p_is_await && !p_is_root) {
 		push_error(vformat(R"*(Function "%s()" is a coroutine, so it must be called with "await".)*", p_call->function_name), p_call->callee);
 	}
 

modules/gdscript/gdscript_analyzer.h

@@ -78,12 +78,12 @@ class GDScriptAnalyzer {
 	void resolve_return(GDScriptParser::ReturnNode *p_return);
 
 	// Reduction functions.
-	void reduce_expression(GDScriptParser::ExpressionNode *p_expression);
+	void reduce_expression(GDScriptParser::ExpressionNode *p_expression, bool p_is_root = false);
 	void reduce_array(GDScriptParser::ArrayNode *p_array);
 	void reduce_assignment(GDScriptParser::AssignmentNode *p_assignment);
 	void reduce_await(GDScriptParser::AwaitNode *p_await);
 	void reduce_binary_op(GDScriptParser::BinaryOpNode *p_binary_op);
-	void reduce_call(GDScriptParser::CallNode *p_call, bool is_await = false);
+	void reduce_call(GDScriptParser::CallNode *p_call, bool p_is_await = false, bool p_is_root = false);
 	void reduce_cast(GDScriptParser::CastNode *p_cast);
 	void reduce_dictionary(GDScriptParser::DictionaryNode *p_dictionary);
 	void reduce_get_node(GDScriptParser::GetNodeNode *p_get_node);