The way I read the perldoc quote posted by parv (but I'm no expert), the compiler says "Hmmmm, we have +BIRD. I have no idea what BIRD is (haven't decided yet), but no matter what it is, but there's this unary + in front of it. Lessee, that + isn't between a function and a list of arguments, so it must have no effect whatsoever. That leaves us with a bareword BIRD; I know what to do with that."

#my sig used to say 'I humbly seek wisdom. '. Now it says:
use strict;
use warnings;
I humbly seek wisdom.

In reply to Re^3: On quoting the lhs of '=>' by goibhniu
in thread On quoting the lhs of '=>' by rovf

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