I would certainly not do the require in an eval, and then not inspect $@. Because in your code fragment, what's going to happen if CONF-$x contains code that doesn't compile? The require would die, but you trap it without dealing with it. I'd use something like this:

    my $x = "A";
    require "CONF-$x.pm";   # Note the .pm!
    "CONF-$x" -> import if "CONF-$x" -> can ("import");
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Abigail