[commit: ghc] wip/redundant-constraints's head updated: Error message wibbles following -fwarn-redundant-constraints (02ddcd2)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/redundant-constraints' now includes:

     633814f Mark T9938 as not broken
     af4d998 Don't do a half-hearted recompilation check in compileOne
     2223e19 Fix #9243 so recompilation avoidance works with -fno-code
     d84742b Update Cabal submodule to latest 1.22 snapshot
     63cf7a4 Modify a couple of error messages slightly
     eaf2638 Replace fixVarSet with transCloVarSet
     8088ab6 Remove redundant constraints in GHC source code discovered by -fwarn-redundant-constraints
     b129f95 Always generalise a partial type signature
     e4c7531 Use a less fragile method for defaulting
     191b889 wibble to robustify-defaulting
     6ec089a Print singleton consraints without parens
     440e39e Major patch to add -fwarn-redundant-constraints
     357c3ac User manual wibble
     02ddcd2 Error message wibbles following -fwarn-redundant-constraints