Merge pull request #6173 from haskell/ignore-invalid-fields

parser: Clearly state that invalid fields are ignored

Cabal/Distribution/FieldGrammar/Parsec.hs

@@ -266,7 +266,7 @@ instance FieldGrammar ParsecFieldGrammar where
                 for_ (Map.toList unknownFields) $ \(name, fields) ->
                     for_ fields $ \(MkNamelessField pos _) ->
                         parseWarning pos PWTUnknownField $
-                            "The field " <> show name <> " is available only since the Cabal specification version " ++ showCabalSpecVersion vs ++ "."
+                            "The field " <> show name <> " is available only since the Cabal specification version " ++ showCabalSpecVersion vs ++ ". This field will be ignored."
 
                 pure def
 

Cabal/tests/ParserTests/regressions/multiple-libs-2.check

-multiple-libs-2.cabal:17:3: The field "visibility" is available only since the Cabal specification version 3.0.
+multiple-libs-2.cabal:17:3: The field "visibility" is available only since the Cabal specification version 3.0. This field will be ignored.
 No 'category' field.
 No 'maintainer' field.
 No 'description' field.

Cabal/tests/ParserTests/regressions/multiple-libs-2.format

-multiple-libs-2.cabal:17:3: The field "visibility" is available only since the Cabal specification version 3.0.
+multiple-libs-2.cabal:17:3: The field "visibility" is available only since the Cabal specification version 3.0. This field will be ignored.
 cabal-version: 2.0
 name:          multiple-libs
 version:       0

Cabal/tests/ParserTests/regressions/wl-pprint-indef.format

-wl-pprint-indef.cabal:28:3: The field "mixins" is available only since the Cabal specification version 2.0.
-wl-pprint-indef.cabal:27:3: The field "signatures" is available only since the Cabal specification version 2.0.
-wl-pprint-indef.cabal:23:3: The field "mixins" is available only since the Cabal specification version 2.0.
+wl-pprint-indef.cabal:28:3: The field "mixins" is available only since the Cabal specification version 2.0. This field will be ignored.
+wl-pprint-indef.cabal:27:3: The field "signatures" is available only since the Cabal specification version 2.0. This field will be ignored.
+wl-pprint-indef.cabal:23:3: The field "mixins" is available only since the Cabal specification version 2.0. This field will be ignored.
 cabal-version: >=1.6
 name:          wl-pprint-indef
 version:       1.2