pub trait NightlyQuirksFunctionMut {
type InputType;
type OutputType;
// Required method
fn call_mut(&mut self, value: Self::InputType) -> Self::OutputType;
}pub trait NightlyQuirksFunctionMut {
type InputType;
type OutputType;
// Required method
fn call_mut(&mut self, value: Self::InputType) -> Self::OutputType;
}