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  1. or download this
    $ perl -MO=Concise,-exec -we'my $foo = scalar <STDIN>'
1  <0> enter 
...
5  <1> readline[t3] sKS/1
6  <@> leave[1 ref] vKP/REFC
-e syntax OK
  2. or download this
    $ perl -MO=Concise,-exec -we' $foo.=<STDIN>'
Name "main::foo" used only once: possible typo at -e line 1.
...
4  <#> rcatline[*STDIN] sS
5  <@> leave[1 ref] vKP/REFC
-e syntax OK