Crate el_macro 

Macros

bind

Binds expression e to a new variable n if it ‘has a value’ / ‘is ok’. Otherwise, executes the optional error handler h and evaluates the f expression.

if_matches

Maps pattern’s bound variables to Some if the provided expression matches the pattern.

Traits

IntoResult

Tells the bind macro whether the given expression yielded a bindable value or an error.