Foreach Loops

The "foreach" loop iterates over a normal list value and sets
the variable VAR to be each element of the list in turn.  If
the variable is preceded with the keyword "my", then it is
lexically scoped, and is therefore visible only within the
loop.  Otherwise, the variable is implicitly local to the
loop and regains its former value upon exiting the loop.  If
the variable was previously declared with "my", it uses that
variable instead of the global one, but it's still localized
to the loop.  This implicit localisation occurs only in a
"foreach" loop.