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BEGIN { require bytes; bytes->import if $condition }

$foo = $a;
BEGIN { require strict; strict->import if 1 }
...
Variable "$foo" is not imported at x line 3.
Global symbol "$foo" requires explicit package name at x line 3.
x had compilation errors.

$foo = $a;
BEGIN { require strict; strict->import if 0 }
$foo = $a;
__END__