[perl #64820] Double

[Carl Mäsak]

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<masak> rakudo: .say for $_ for <a b c>, <d e f>
<p6eval> rakudo 341f44: OUTPUT«Use of uninitialized value␤␤Could not
find non-existent sub for [...]
* masak submits rakudobug
<masak> std: .say for $_ for <a b c>, <d e f>
<p6eval> std 26257: OUTPUT«##### PARSE FAILED #####␤Malformed block [...]

S04 says "a looping statement modifier is allowed to contain a single
conditional statement modifier", which seems to imply that other
combinations are not allowed. So STD is right not to parse this, and
Rakudo is wrong. Both could give more diagnostic error messages.

Double statement-ending 'if' seems to have the same issues, as well as
an inner statement-ending 'for' in an outer statement-ending 'if'.