Simon Peyton Jones via ghc-devs
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