This test exercises stub methods functionality with variadic parameters. In golang/go#61693 stubmethods was panicking in this case. -- go.mod -- module mod.com go 1.18 -- main.go -- package main type C int func F(err ...error) {} func _() { var x error F(x, C(0)) //@quickfix(re"C.0.", re"missing method Error", stub) } -- @stub/main.go -- @@ -5 +5,5 @@ +// Error implements error. +func (c C) Error() string { + panic("unimplemented") +} +