Macro call_rust_trait_impl 

macro_rules! call_rust_trait_impl {
    (unsafe mut $self:expr, $method:ident ( $($arg:expr),* )) => { ... };
    (unsafe $self:expr, $method:ident ( $($arg:expr),* )) => { ... };
    (mut $self:expr, $method:ident ( $($arg:expr),* )) => { ... };
    ($self:expr, $method:ident ( $($arg:expr),* )) => { ... };
}