;lib: disable doctest with GHC 8.10 for now (sol/doctest#246)

hledger-lib/package.yaml

@@ -157,7 +157,6 @@ library:
 tests:
 
   unittest:
-    buildable: true
     source-dirs: test
     main: unittest.hs
     other-modules: []  # prevent double compilation, https://github.com/sol/hpack/issues/188
@@ -168,6 +167,7 @@ tests:
   # so we ensure this is generated, see cabal.project.
   # https://github.com/simonmichael/hledger/issues/1139
   doctest:
+    buildable: true
     source-dirs: test
     main: doctests.hs  # can't call it doctest.hs ("File name does not match module name")
     other-modules: []  # prevent double compilation, https://github.com/sol/hpack/issues/188
@@ -187,8 +187,9 @@ tests:
     # - condition: os(darwin) && impl(ghc >= 8.4)
     #   buildable: false
 
-    # ghc 8.0 on linux:
-    #  Hledger/Read/JournalReader.hs:126: failure in expression `rejp (journalp <* eof) "2015/1/1\n a  0\n"' ... Variable not in scope: rejp :: f0 a0 -> [Char] -> t
+    # ghc 8.10 isn't supported by doctest yet, https://github.com/sol/doctest/issues/246
+    # ghc 8.0 on linux gives Hledger/Read/JournalReader.hs:126: failure in expression `rejp (journalp <* eof) "2015/1/1\n a  0\n"' ... Variable not in scope: rejp :: f0 a0 -> [Char] -> t
+    # must use one conditional here, https://github.com/sol/hpack/issues/379
     when:
-    - condition: (impl(ghc < 8.2))
+    - condition: (impl(ghc < 8.2) || impl(ghc >= 8.10))
       buildable: false