December 2001 - Cvs-nhc98

hPutStr internal error
by Ian Lynagh 28 Dec '01

28 Dec '01

Hiya With http://c93.keble.ox.ac.uk/~ian/igl-0.0.8.tar.gz compiled with make nhc I get $ ./Project -d +RTS -H4M -RTS < Demo.lhs > Demo.tex hPutStr: internal error, not a cons-list! hPutStr: got CONSTRW src=0x809b384 size=1 hPutStr: char='I' $ Thanks Ian

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default types
by Ian Lynagh 20 Dec '01

20 Dec '01

On Fri, Dec 14, 2001 at 09:28:30PM +0000, Ian Lynagh wrote: > > If I have the module > > module TT (Foo(..)) where > > default (Foo, [Foo], Foo -> Int) > > data Foo = Foo deriving (Eq, Show) > > instance Num Foo where {} > instance (Eq a, Show a) => Num [a] where {} > instance Eq (a -> b) where {} > instance Show (a -> b) where {} > instance Num (a -> b) where {} > > nhc tells me > > Error when renaming:: > Illegal type in default at 4:17 This is apparently an nhc bug. Thanks Ian

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nhc doesn't default types as aggressivley as it should?
by Ian Lynagh 20 Dec '01

20 Dec '01

I think that in module Q where Just a = if 5 == 5 then Just 6 else Nothing (which gives me ====== Errors after type inference/checking: Context for Prelude.Num needed in left hand pattern at 4:3. ) nhc should default the type of a to Integer, and ghc and hugs seem to agree. Thanks Ian

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"No default for Main.Class13 at nopos.(861,[(366,865)])"
by Ian Lynagh 20 Dec '01

20 Dec '01

What does No default for Main.Class13 at nopos.(861,[(366,865)]) mean? The class looks like class Class13 a where class13_1 :: a -> Int class13_2 :: String followed by a nestable comment and then another class. Thanks Ian

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nhc doesn't cope with funlhs -> ( funlhs ) apat {apat}
by Ian Lynagh 19 Dec '01

19 Dec '01

Hi This module: module Q where f :: Int -> Int -> Int (f a) b = a + b causes Fail: Need infix operator at 5:9 (5:9 being the b) but it is valid as funlhs -> ( funlhs ) apat {apat} Thanks Ian

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Fix error (nthcon: n==0 con==37) due to an interface file
by malcolm＠sparud.net 19 Dec '01

19 Dec '01

malcolm: Wed Dec 19 15:54:17 CET 2001 Update of /usr/src/master/nhc/src/prelude/LowB In directory hinken:/tmp/cvs-serv18916 Modified Files: PrimOpenSocket.hs Log Message: Fix error (nthcon: n==0 con==37) due to an interface file containing `data IO a' instead of `newtype IO a'.

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Accept an infix decl inside a class decl.
by malcolm＠sparud.net 19 Dec '01

19 Dec '01

malcolm: Wed Dec 19 19:03:11 CET 2001 Update of /usr/src/master/nhc/src/compiler98 In directory hinken:/tmp/cvs-serv20026 Modified Files: Need.hs Rename.hs Log Message: Accept an infix decl inside a class decl. (However the infix info is not yet used/respected.)

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parse errors with where and explicit layout
by Ian Lynagh 19 Dec '01

19 Dec '01

Hiyas, The module module Q where f = 3 where { a = 3; } gives me 5:7 Found _where_ but expected a {-end-of-definition-or-EOF-} Thanks Ian

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nhc breaks when given fixity information in cdecls
by Ian Lynagh 19 Dec '01

19 Dec '01

With the following module: module Demo where class Class13 a where f :: a -> a infixl 9 `f` I get Fail: Need.hs:246: Non-exhaustive patterns in function needClassInst I noticed lots of warning while building nhc (one of which I'd have thought would have highlighted the existence of this bug), as well as some dangerous mixing of tabs and spaces. Would you apply patches to fix these (not that I am at all sure if/when I will have time to make them)? I think that if the builds were generally warning free then the existence of a warning may have helped detect the bug earlier. For the latter I would be changing tabs to spaces as tabs in Haskell are harder to do correctly than other languages, and looking at the source code out there people have enough trouble with languages like C. Thanks Ian

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Fix to accept import M hiding () and import M hiding
by malcolm＠sparud.net 19 Dec '01

19 Dec '01

malcolm: Wed Dec 19 18:14:47 CET 2001 Update of /usr/src/master/nhc/src/compiler98 In directory hinken:/tmp/cvs-serv19750/src/compiler98 Modified Files: Parse2.hs Log Message: Fix to accept import M hiding () and import M hiding (,).

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