sub definedWord
{
my( $word )= @_;
return eval "use strict; my \$x= sub { $word }; 1"
|| ( warn("$@\n"), $@ !~ /^Bareword/ );
}
@ARGV= qw( definedWord time system foo BEGIN if -e lt goto last )
if ! @ARGV;
for( @ARGV ) {
printf "$_:\t%sdefined\n", definedWord($_) ? "" : "UN";
}
is one interesting interpretation, producing:
definedWord: defined
time: defined
system: defined
Bareword "foo" not allowed while "strict subs" in use at (eval 4) line
+ 1.
foo: UNdefined
BEGIN: defined
syntax error at (eval 6) line 1, at EOF
if: defined
-e: defined
syntax error at (eval 8) line 1, near "{ lt"
lt: defined
goto: defined
last: defined
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