arg

mir

Macro arg 

Source 
macro_rules! arg {
    ($name:ident : $ty:expr) => { ... };
    ($name:ident : $ty:expr , $default:expr) => { ... };
}
Expand description

Macro to create a FnArg. Second arg is a expr that evaluates to a string. Optionally takes a default. arg!(count: “int” = 500)