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  1. or download this
    perl -wE " $x = q{txt}; sub ref {return $x . q{r};}; say &ref($x); "
perl -wE " $x = q{txt}; sub ref {return $x . q{r};}; say ref($x); "
perl -wE " $x = q{txt}; sub say {return $x . q{r};}; say &say($x); "
perl -wE " $x = q{txt}; sub say {return $x . q{r};}; say say($x); "
perl -E " say $^V "
  2. or download this
    perl -wE ' $x = q{txt}; sub ref {return $x . q{r};}; say &ref($x); '
perl -wE ' $x = q{txt}; sub ref {return $x . q{r};}; say ref($x); '
perl -wE ' $x = q{txt}; sub say {return $x . q{r};}; say &say($x); '
perl -wE ' $x = q{txt}; sub say {return $x . q{r};}; say say($x); '
perl -E ' say $^V '
  3. or download this
    $ perl -wE " $x = q{txt}; sub ref {return $x . q{r};}; say &ref($x); "
txtr

...

$ perl -E " say $^V "
v5.14.1