Fix build on old GHCs

Author: hasufell

System/OsPath/Internal.hs

@@ -117,7 +117,7 @@ osp = QuasiQuoter
 #if defined(mingw32_HOST_OS) || defined(__MINGW32__)
   { quoteExp = \s -> do
       osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF16le ErrorOnCodingFailure) $ s
-      when (not $ isValid osp') $ fail ("filepath now valid: " <> show osp')
+      when (not $ isValid osp') $ fail ("filepath now valid: " ++ show osp')
       lift osp'
   , quotePat  = \_ ->
       fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"
@@ -129,7 +129,7 @@ osp = QuasiQuoter
 #else
   { quoteExp = \s -> do
       osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF8 ErrorOnCodingFailure) $ s
-      when (not $ isValid osp') $ fail ("filepath now valid: " <> show osp')
+      when (not $ isValid osp') $ fail ("filepath now valid: " ++ show osp')
       lift osp'
   , quotePat  = \_ ->
       fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"

System/OsPath/Posix.hs

@@ -16,7 +16,7 @@ pstr =
   QuasiQuoter
   { quoteExp = \s -> do
       ps <- either (fail . show) pure $ encodeWith (mkUTF8 ErrorOnCodingFailure) $ s
-      when (not $ isValid ps) $ fail ("filepath now valid: " <> show ps)
+      when (not $ isValid ps) $ fail ("filepath now valid: " ++ show ps)
       lift ps
   , quotePat  = \_ ->
       fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"

System/OsPath/Windows.hs

@@ -17,7 +17,7 @@ pstr =
   QuasiQuoter
   { quoteExp = \s -> do
       ps <- either (fail . show) pure $ encodeWith (mkUTF16le ErrorOnCodingFailure) $ s
-      when (not $ isValid ps) $ fail ("filepath now valid: " <> show ps)
+      when (not $ isValid ps) $ fail ("filepath now valid: " ++ show ps)
       lift ps
   , quotePat  = \_ ->
       fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"

filepath.cabal

@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               filepath
-version:            1.4.99.3
+version:            1.4.99.4
 
 -- NOTE: Don't forget to update ./changelog.md
 license:            BSD-3-Clause