message: Remove ParameterSpec::set_function_name
  Summary: `ParameterSpec` accepts function name in constructor.
diff: @@ -148,11 +148,6 @@ impl<V> ParametersSpec<V> {
  }
  }
  - /// Change the function name.
  - pub fn set_function_name(&mut self, name: String) {
  - self.function_name = name
  - }
  -
  fn add(&mut self, name: &str, val: ParameterKind<V>) {
  assert!(!matches!(val, ParameterKind::Args | ParameterKind::KWargs));
  