package Foo;

# lots of use statements here.
use Import::Into;

sub import {
    my $target = caller;
    'strict'->import::into($target);
    'warnings'->import::into($target, qw(FATAL utf8));
    if ($] >= 5.017011) {
        # THIS IS THE PROBLEM LINE
        'warnings'->unimport::out_of($target, 'experimental::smartmatch');
    }
}