Support value/type namespaces on identifier links

Identifier links can be prefixed with a 'v' or 't' to indicate the value or
type namespace of the desired identifier. For example:

-- | Some link to a value: v'Data.Functor.Identity'
--
-- Some link to a type: t'Data.Functor.Identity'

The default is still the type (with a warning about the ambiguity)

1 files changed, 6 insertions, 0 deletions

diff --git a/haddock-library/test/Documentation/Haddock/ParserSpec.hs b/haddock-library/test/Documentation/Haddock/ParserSpec.hs
index 6269184a..e186a5cf 100644
--- a/haddock-library/test/Documentation/Haddock/ParserSpec.hs
+++ b/haddock-library/test/Documentation/Haddock/ParserSpec.hs
@@ -132,6 +132,12 @@ spec = do
       it "can parse an identifier that starts with an underscore" $ do
         "'_x'" `shouldParseTo` DocIdentifier "_x"
 
+      it "can parse value-namespaced identifiers" $ do
+        "v'foo'" `shouldParseTo` DocIdentifier "foo"
+
+      it "can parse type-namespaced identifiers" $ do
+        "t'foo'" `shouldParseTo` DocIdentifier "foo"
+
     context "when parsing operators" $ do
       it "can parse an operator enclosed within single quotes" $ do
         "'.='" `shouldParseTo` DocIdentifier ".="