Commits on Aug 30, 2022

1. tracing-core: relax get_default's argument to FnOnce …

   This change increases the flexibility of `get_default`.
   
   It was already the case that `get_default`'s argument was only
   invoked at-most once. However, the compiler could not prove this,
   and thus required that the argument be `FnMut`. This commit
   introduces `UnsafeFnMut`, a type that wraps an `FnOnce` and
   provides an unsafe interface for invoking it in cases where the
   compiler cannot otherwise prove that it's only invoked at-most
   once.

   

   jswrenn committed Aug 30, 2022
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