Regression in 2.15.7
#6621
Comments
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@lehins, thanks for reporting. I can reproduce with
{-# LANGUAGE CPP #-}
{-# LANGUAGE PackageImports #-}
module StackSetupShim where
-- | Stack no longer supports Cabal < 1.24 and, consequently, GHC versions
-- before GHC 8.0 or base < 4.9.0.0. Consequently, we do not need to test for
-- the existence of the MIN_VERSION_Cabal macro (provided from GHC 8.0).
import Data.List ( stripPrefix )
import Distribution.ReadE ( ReadE (..) )
...
mainOverride :: IO ()
mainOverride = do
... |
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LTS 18.28 specifies GHC 8.10.7 and (which is revision 3)
and GHC 8.10.7 specifies GHC 8.10.7 definitely provides the
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Something like the following does not fail (reformatted): |
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The GHC error |
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It seems to be something with the CPP directives in |
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@lehins, I have found the cause. It was rather obscure. The combination of (a) the |
Fix #6621 Remove Haddock style comments
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@lehins, this fix will be included in Stack 3.1.1. |
General summary/comments (optional)
I suspect #6542 introduced a regression, although I might be wrong. Problem happens with LTS-18 and older (was able to reproduce all the way to LTS-11)
Problem happens when building a package that depends on
doctest, which depends onghc-pathsand that is where problem seems to pop up:I was able to confirm that
stack-2.15.5and earlier do not have this problemSteps to reproduce
Expected
No build failure.
Actual
Build failure
If you suspect that a Stack command misbehaved, please include the output of
that command in
--verbosemode. If the output is larger than a page pleasepaste the output in a Gist.
Stack version
Method of installation
Platform
Linux x86_64
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