I have been trying the new `--share` option implemented in hadrian but I haven't actually managed to complete any builds yet with it enabled after the initial one. The current error is ``` <no location info>: error: ‘Var.AnonArgFlag’ is exported by the hs-boot file, but not exported by the module Error when running Shake build system: at action, called at src/Rules.hs:35:19 in main:Rules at need, called at src/Rules.hs:52:5 in main:Rules * Depends on: _build/stage0/bin/ghc at need, called at src/Utilities.hs:71:18 in main:Utilities * Depends on: _build/stage0/compiler/build/libHSghc-8.9.a at need, called at src/Rules/Library.hs:118:5 in main:Rules.Library * Depends on: _build/stage0/compiler/build/Var.o * Raised the exception: user error (Development.Shake.cmd, system command failed ``` I get this after building Simon's `FunTy` patch which does add this flag and the definition to `Var.hs-boot` and then switching back to master with the cache enabled. Could you please write down some advice Andrey about how to solve issues like this? It seems very fragile making sure that every case is covered. Cheers, Matt