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sub foo ($x) { say($x) }

sub foo ($x:) { say($x) }

    sub foo($x, $y, $z) {...}    # expects three scalars
    @onetothree = 1..3;          # array stores three scalars
...
    foo(1,2,3);                  # okay:  three args found
    foo(@onetothree);            # error: only one arg
    foo(*@onetothree);           # okay:  @onetothree flattened to thr
+ee args

sub perl6foo ($bar, $baz) { }

sub perl5foo { my ($bar, $baz) = @_; }