"<null>" string appears in warning message

[lbilli]

In Julia 1.12.0-beta3, during precompilation, a warning message contains the string "<null>" instead of a more meaningful name.

 1 dependency had output during precompilation:
┌ UTCDateTimes
│  WARNING: Constructor for type "DateTime" was extended in `UTCDateTimes` without explicit qualification or import.
│    NOTE: Assumed "DateTime" refers to `<null>.DateTime`. This behavior is deprecated and may differ in future versions.`
│    NOTE: This behavior may have differed in Julia versions prior to 1.12.
│    Hint: If you intended to create a new generic function of the same name, use `function DateTime end`.
│    Hint: To silence the warning, qualify `DateTime` as `<null>.DateTime` in the method signature or explicitly `import <null>: DateTime`.
└  

julia> versioninfo()
Julia Version 1.12.0-beta3
Commit faca79b503a (2025-05-12 06:47 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × Intel(R) Core(TM) i3-7100 CPU @ 3.90GHz
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, skylake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 4 virtual cores)