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perl -e "print eval qq/require DBI; DBI::SQL_VARCHAR/ || $@;"
>>> prints 'DBI::SQL_VARCHAR'
...

perl -e "$it=q/SQL_XVARCHAR/; print eval qq/require DBI; DBI::$it()/ |
+| $@;"
>>> prints 'Can't locate auto/DBI/SQL_XVARCHA.al...'

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   eval "DBI::SQL_VARCHAR";
   # is the same as 
   $it='DBI::SQL_VARCHAR'; eval { $it };