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usage-name
Combined from primary sources listed below.

In Parameter§

See primary documentation in context for method usage-name. 

method usage-name(Parameter:D: --> Str:D)

Returns the parameter name without any sigils and twigils.

If the parameter is anonymous, an empty string will be returned.

Note: Before Rakudo version 2020.08 the return value for an anonymous parameter was Nil.

my Signature $sig = :(Str $x, Str @*l, Bool);
say $sig.params[0].usage-name;           # OUTPUT: «x␤»
say $sig.params[1].usage-name;           # OUTPUT: «l␤»
say $sig.params[2].usage-name;           # OUTPUT: «␤»