Not inlining 'new' for Foo since it has method modifiers which would be lost if it were inlined

Could someone please explain what's happening here?

$ perl -MThrowable::Error -le 'package Foo; use Moose; extends
"Throwable::Error"; Foo->meta->make_immutable'
Not inlining 'new' for Foo since it has method modifiers which would be
lost if it were inlined

I see that not calling make_immutable avoids the warning, but I'm not
understanding why.

Thanks,



-- 
Bill Moseley
[email protected]