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multi-invocant
Combined from primary sources listed below.

In Parameter§

See primary documentation in context for method multi-invocant. 

method multi-invocant(Parameter:D: --> Bool:D)

Returns True if the parameter affects multi dispatch.

my Signature $sig = :($a;; $b);
say $sig.params[0].multi-invocant;                 # OUTPUT: «True␤»
say $sig.params[1].multi-invocant;                 # OUTPUT: «False␤»