Enum ParamNameField 

pub enum ParamNameField {
    Simple(&'static str),
    WithFallback(&'static str),
    RustPattern,
}

How to extract the parameter name.

Variants

Simple(&'static str)

Simple field name: child_by_field_name(field)

WithFallback(&'static str)

Field with fallback to first named child if identifier

RustPattern

Rust pattern matching (identifier, mut_pattern, reference_pattern)