GDScript: Fix vararg method calls with exact arguments

modules/gdscript/gdscript_compiler.cpp

@@ -196,7 +196,11 @@ static bool _is_exact_type(const PropertyInfo &p_par_type, const GDScriptDataTyp
 	}
 }
 
-static bool _have_exact_arguments(const MethodBind *p_method, const Vector<GDScriptCodeGenerator::Address> &p_arguments) {
+static bool _can_use_ptrcall(const MethodBind *p_method, const Vector<GDScriptCodeGenerator::Address> &p_arguments) {
+	if (p_method->is_vararg()) {
+		// ptrcall won't work with vararg methods.
+		return false;
+	}
 	if (p_method->get_argument_count() != p_arguments.size()) {
 		// ptrcall won't work with default arguments.
 		return false;
@@ -563,7 +567,7 @@ GDScriptCodeGenerator::Address GDScriptCompiler::_parse_expression(CodeGen &code
 							self.mode = GDScriptCodeGenerator::Address::SELF;
 							MethodBind *method = ClassDB::get_method(codegen.script->native->get_name(), call->function_name);
 
-							if (_have_exact_arguments(method, arguments)) {
+							if (_can_use_ptrcall(method, arguments)) {
 								// Exact arguments, use ptrcall.
 								gen->write_call_ptrcall(result, self, method, arguments);
 							} else {
@@ -613,7 +617,7 @@ GDScriptCodeGenerator::Address GDScriptCompiler::_parse_expression(CodeGen &code
 									}
 									if (ClassDB::class_exists(class_name) && ClassDB::has_method(class_name, call->function_name)) {
 										MethodBind *method = ClassDB::get_method(class_name, call->function_name);
-										if (_have_exact_arguments(method, arguments)) {
+										if (_can_use_ptrcall(method, arguments)) {
 											// Exact arguments, use ptrcall.
 											gen->write_call_ptrcall(result, base, method, arguments);
 										} else {

modules/gdscript/tests/scripts/analyzer/features/vararg_call.gd

@@ -0,0 +1,6 @@
+signal ok()
+
+@warning_ignore("return_value_discarded")
+func test():
+	ok.connect(func(): print('ok'))
+	emit_signal(&'ok')

modules/gdscript/tests/scripts/analyzer/features/vararg_call.out

@@ -0,0 +1,2 @@
+GDTEST_OK
+ok