func containsMethod(m *st.FunctionSymbol, sym st.ITypeSymbol) (bool, *errors.GoRefactorError) {
candidate, ok := sym.Methods().LookUp(m.Name(), "")
if !ok {
return false, nil
}
cand, ok := candidate.(*st.FunctionSymbol)
if !ok {
panic("non-method symbol " + candidate.Name() + " in type " + sym.Name() + " methods()")
}
if !st.EqualsMethods(cand, m) {
return true, &errors.GoRefactorError{ErrorType: "implement interface error", Message: "type has a method, named " + cand.Name() + "but it has signature, different from the necessary one"}
}
return true, nil
}
