Thanks. Fixed.
Yes, there's nothing special about lvalue subs. f() doesn't cause the list assignment operator to be used, but (f()) does.
$ perl -wle'sub f :lvalue { $x,$y } f()=(4,5); print $x,$y'
Useless use of a constant in void context at -e line 1.
Use of uninitialized value in print at -e line 1.
5
$ perl -wle'sub f :lvalue { $x,$y } (f())=(4,5); print $x,$y'
45
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