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doc: note persistent exts are sometimes needed

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Wojciech Nawrocki 2022-04-10 20:08:37 -04:00 • committed by Leonardo de Moura
parent 30dfabb2c7
commit 367b0fc80f
1 changed files with 4 additions and 1 deletions
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5
src/Lean/Environment.lean
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@ -282,7 +282,10 @@ end EnvExtension
/- Environment extensions can only be registered during initialization.
Reasons:
1- Our implementation assumes the number of extensions does not change after an environment object is created.
2- We do not use any synchronization primitive to access `envExtensionsRef`. -/
2- We do not use any synchronization primitive to access `envExtensionsRef`.
Note that by default, extension state is *not* stored in .olean files and will not propagate across `import`s.
For that, you need to register a persistent environment extension. -/
def registerEnvExtension {σ : Type} (mkInitial : IO σ) : IO (EnvExtension σ) := EnvExtensionInterfaceImp.registerExt mkInitial
private def mkInitialExtensionStates : IO (Array EnvExtensionState) := EnvExtensionInterfaceImp.mkInitialExtStates