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The current implementation requires any implementations of
Replacer
bevalid for all possible lifetimes. However, this is neither required nor
is it always desirable. For example, a user who wishes to use the
lifetime of the input text as some part of the return type when
interacting with these APIs would end up with a closure that is valid
for one specific lifetime.
A concrete example of where this was problematic was described in
#775
Any future code that does require a
Replacer
which is valid for alllifetimes can do so with HRTB:
or
R: Replacer<'_>
in some contexts