Do not declare a type that is never used #3
Merged
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Previously, ClassName was declared, but the declared version of it was
never defined. Instead, the declared version was replaced by LoadableClass.
I believe this to be the underlying cause of
https://rt.cpan.org/Public/Bug/Display.html?id=119534, which exposed
this error as the previously unused sub was being called by
undefer_all.