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-rw-r--r--src/Haddock/Types.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Haddock/Types.hs b/src/Haddock/Types.hs
index ac3f2b5f..544c7575 100644
--- a/src/Haddock/Types.hs
+++ b/src/Haddock/Types.hs
@@ -44,6 +44,8 @@ type HsDocString = HsDoc Name
type LHsDocString = Located HsDocString
#endif
+-- | Arguments and result are indexed by Int, zero-based from the left,
+-- because that's the easiest to use when recursing over types.
type FnArgsDoc name = Map Int (HsDoc name)
type DocForDecl name = (Maybe (HsDoc name), FnArgsDoc name)