On 19/04/2010 10:29, Matthias Kilian wrote:
[Warning: much confusion below ;-)]
Hi,
On Fri, Apr 09, 2010 at 04:48:05AM -0700, Ian Lynagh wrote:
Mon Mar 29 18:10:20 PDT 2010 David Waern<[email protected]>
* Add Data and Typeable instances to HsSyn
The instances (and deriving declarations) have been taken from the ghc-syb
package.
[...]
This patch appears to uncover some strange problem during bootstrapping
a ghc-6.13 stage1 compiler with an existing ghc-6.12 compiler.
Initially, it lead to the famous panic involved with outdated
interface files when compiling HsExpr.lhs:
ghc: panic! (the 'impossible' happened)
(GHC version 6.12.2 for x86_64-unknown-openbsd):
tcIfaceGlobal (local): not found:
ghc-6.13:HsExpr.$fxDataHsExpr{v rlX}
So I tried to just add some instance declarations to HsExpr.lhs-boot
like this:
instance Typeable i => Typeable (HsExpr i)
instance Typeable i => Typeable (HsSplice i)
instance Typeable i => Typeable (MatchGroup i)
instance Typeable i => Typeable (GRHSs i)
But now the compilation of HsExpr fails with:
compiler/hsSyn/HsExpr.lhs:1:0:
instance (Typeable i) => Typeable (GRHSs i) -- Defined in HsExpr
is defined in the hs-boot file, but not in the module itself
compiler/hsSyn/HsExpr.lhs:1:0:
instance (Typeable i) => Typeable (HsExpr i) -- Defined in HsExpr
is defined in the hs-boot file, but not in the module itself
compiler/hsSyn/HsExpr.lhs:1:0:
instance (Typeable i) => Typeable (HsSplice i) -- Defined in HsExpr
is defined in the hs-boot file, but not in the module itself
compiler/hsSyn/HsExpr.lhs:1:0:
instance (Typeable i) => Typeable (MatchGroup i)
-- Defined in HsExpr
is defined in the hs-boot file, but not in the module itself
Maybe my Haskell knowledge is a little bit rusty (after all, I
didn't do *real* Haskell work for a long time), but shouldn't the
added derive clauses in HsSyn.lhs cause those instances to exists?
And in case I'm wrong: what's causing the panic? Is it possible
that the build pulls in the wrong .hi file (from the ghc-6.12
installation)?
The panic is obviously a bug, but it's not clear whether it is a bug in
the build system (a missing dependency) or in GHC. Can you give us
instructions to reproduce?
Cheers,
Simon
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