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# note that versions prior to 5.6.0 require the numeric
# representation of the version number and don't recognize
# v5.6.0 or 5.6.0, for example.

BEGIN { require 5.006_00 }

$ perl553 -e 'BEGIN{require 5.006_00}; use warnings;'
Perl 5.006 required--this is only version 5.00503, stopped at -e line 
+1.
BEGIN failed--compilation aborted at -e line 1.

use 5.006_00;