It is "unspace". Whitespace is not allowed before subscripts or ".". Apparently this is required to allow "if" conditions without parens and is part of the "space is sometimes significant" path that was taken. (See: Synopsis 3 and the linked Synopsis 2)

Update: Below, moritz clarifies that "if" without parens was not the reason for forbidding whitespace around "." methods calls, merely another of the consequences.

Good Day,
    Dean

In reply to Re^3: Perl 6 implementation of the following Perl 5 code by duelafn
in thread Perl 6 implementation of the following Perl 5 code by konnjuta

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