stage2 build fails

[Ben Gamari]

Simon Peyton Jones via ghc-devs <ghc-devs at haskell.org> writes:

> I'm getting this with "sh validate -legacy"
>
> compiler/main/DynFlags.hs:1344:15: error: [-Woverlapping-patterns, -Werror=overlapping-patterns]
>
>     Pattern match is redundant
>
>     In an equation for 'settings': settings s | otherwise = ...
>
>      |
>
> 1344 |             | otherwise = panic $ "Invalid cfg parameters." ++ exampleString
>
>      |               ^^^^^^^^^
> This is when compiling the stage-2 compiler.  There's an ifdef in DynFlags thus
>
> #if __GLASGOW_HASKELL__ <= 810
>
>             | otherwise = panic $ "Invalid cfg parameters." ++ exampleString
>
> #endif
> but somehow it's not triggering for the stage2 compiler.
> Any ideas?  It's blocking a full build.
> This #ifdef was added in 8038cbd96f4, when GHC became better at reporting redundant code.
> Simon

Indeed it would be nice to know which compiler you are using to
bootstrap. I suspect Sylvain is correct that the alternative can be
removed but first I would like to understand why this is arising only
now.

Cheers,

- Ben
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