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This slang allows you to put whitespace between the name of a subroutine and the opening parenthesis. Be aware that this introduces ambiguous situations, like when you want to pass a List to a sub, or when you need parenthesis around the condition after the keywords if, while and so on...

foo 3, 5;   # 15, as usual
foo(3, 5);  # also 15, as usual
foo (3, 5); # 15, /o\

# It also allows to put space before argument lists in method calls:
42.fmt('-%d-');  # -42-
42.fmt: '-%d-';  # -42-
42.fmt ('-%d-'); # -42-
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