require "Text::CSV" is much different than require Text::CSV

Ah yes, of course. I've written code to do the appropriate munging of a bareword many times, don't know why I forgot it this time. Anyhow my code should really look like this

BEGIN {
  (my $file = ($module =
    somecond() ? "Text::CSV" : "Text::CSV_XS")".pm") =~ s{::}(/)g;

  require $file;
  $module->import;
}
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HTH

_________
broquaint