What does the "?" next to a package name during precompilation mean

Figure this probably means something and it is probably something that one should know.

When precompiling, sometimes there are “?” next to package name. What exactly do these ones mean? E.g. like hre:

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  ? OrdinaryDiffEqHighOrderRK
  ? OrdinaryDiffEqSymplecticRK
  ? OrdinaryDiffEqLowOrderRK
  ? OrdinaryDiffEqVerner
  ? OrdinaryDiffEqFeagin
  ? OrdinaryDiffEqLowStorageRK
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I don’t remember seeing a question mark myself, but the docs says:

? A question mark character indicates that a PrecompilableError was thrown, indicating that precompilation was disallowed, i.e. __precompile__(false) in that package.

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That is most clear, thanks a lot!

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