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-rw-r--r--haddock-api/src/Haddock/Interface/ParseModuleHeader.hs7
1 files changed, 7 insertions, 0 deletions
diff --git a/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs b/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
index 32411e9e..37813d16 100644
--- a/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
+++ b/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
@@ -85,6 +85,13 @@ parseModuleHeader dflags pkgName str0 =
-- the value will be "this is a .. description" and the rest will begin
-- at "The module comment".
+-- | 'C' is a 'Char' carrying its column.
+--
+-- This let us make an indentation-aware parser, as we know current indentation.
+-- by looking at the next character in the stream ('curInd').
+--
+-- Thus we can munch all spaces but only not-spaces which are indented.
+--
data C = C {-# UNPACK #-} !Int Char
newtype P a = P { unP :: [C] -> Maybe ([C], a) }