Returns from a subroutine, eval, or do FILE
with the value
given in EXPR. Evaluation of EXPR may be in list, scalar, or void
context, depending on how the return value will be used, and the context
may vary from one execution to the next (see wantarray). If no EXPR
is given, returns an empty list in list context, the undefined value in
scalar context, and (of course) nothing at all in a void context.
(Note that in the absence of an explicit return, a subroutine, eval,
or do FILE will automatically return the value of the last expression
evaluated.)