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coerce_arg_three_way

r::interpreter::value::traits

Function coerce_arg_three_way 

Source 
pub fn coerce_arg_three_way<T: CoerceArg>(
    val: Option<&RValue>,
    param_name: &str,
) -> Result<RArg<T>, RError>
Expand description

Helper called by FromArgs derive-generated code for RArg<T> fields. Produces the three-way Missing/Null/Value from a raw Option<&RValue>.