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Postings from March 2000
Note also that the interpreter sometimes does concatenation that
the user doesn't see, it sometimes also does *NOT* do concatenation
that the user *DOES* see:
% perl -MO=Deparse,-q -e 'print "foo" . " bar"'
print 'foo bar';
% perl -Dx -e 'print "foo" . " bar"'
{
6 TYPE = leave ===> DONE
FLAGS = (VOID,KIDS,PARENS)
REFCNT = 0
{
1 TYPE = enter ===> 2
}
{
2 TYPE = nextstate ===> 3
FLAGS = (VOID)
LINE = 1
PACKAGE = "main"
}
{
5 TYPE = print ===> 6
FLAGS = (VOID,KIDS)
{
3 TYPE = pushmark ===> 4
FLAGS = (SCALAR)
}
{
4 TYPE = const ===> 5
FLAGS = (SCALAR)
SV = PV("foo bar"\0)
}
}
}
Look! No concat operator!
--tom