Building haddock 2.8.1 with alex 3.0.1 I get the error message:
[ 7 of 33] Compiling Haddock.Lex ( dist/build/Haddock/Lex.hs,
dist/build/Haddock/Lex.o )
src/Haddock/Lex.x:150:17:
Couldn't match expected type `AlexInput'
against inferred type `(t, t1, t2)'
In the first argument of `alexScan', namely `inp'
In the expression: alexScan inp sc
In the expression:
case alexScan inp sc of {
AlexEOF -> []
AlexError _ -> error "lexical error"
AlexSkip inp' _ -> go inp' sc
AlexToken (inp'@(pos', _, _)) len act
->
Haddock 2.8.1 builds correctly (or at least completely) with alex 2.3.5
I'm not sure if this is a bug or a feature - if it's a feature, then the
dependencies for haddock 2.8.1 need updating.
Will
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