for is not an expression, so it shouldn't be suprising that it doesn't have a well-defined value. I think the document is a little vague, but people seem to be hung up on the sentence...
"The return value of the subroutine is the value of the last expression evaluated."
...which probably should be modified to something like...
"The return value of the subroutine is the value of the last syntatic expression."

In reply to Re^3: map { ; ; ; } @array by Anonymous Monk
in thread map { ; ; ; } @array by kwaping

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