Ah, but try this with The Real Comma ... 

perl -l -e 'use constant FOO => "abc"; print %{{ FOO , "def" }}'

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I happened on it earlier at work where everything was as expected -- in hash (reference) assignment -- when constants were used with "," but displayed ugly head when used with "=>". (Yes, calling the constant "variable" as a sub that it really is worked around the problem.)

I had managed to put up with constants not properly interpolating in strings. Not any more.

In reply to Re^2: use constant with parentheses by parv
in thread use constant with parentheses by perlfan99

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