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multi
Combined from primary sources listed below.

In Routine§

See primary documentation in context for method multi 

method multi(Routine:D: --> Bool:D)

Returns True if the routine is a multi sub or method. Note that the name of a multi sub refers to its proto and this method would return false if called on it. It needs to be called on the candidates themselves:

multi foo ($, $) {};
say &foo.multi;             # OUTPUT: «False␤» 
say &foo.candidates».multi; # OUTPUT: «(True)␤»