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STG lint error while compiling master

While compiling e054c5f0 with the following build.mk,

BuildFlavour = devel2
include mk/flavours/$(BuildFlavour).mk

GhcStage2HcOpts += -eventlog
GhcStage1HcOpts += -eventlog

GhcLibHcOpts += -g3 -ddump-to-file -ddump-stg -dcore-lint -dstg-lint -dcmm-lint
GhcRtsHcOpts += -g3
GhcStage2HcOpts += -g3 -ddump-to-file -ddump-stg -dcore-lint -dstg-lint -dcmm-lint

I encountered this STG lint failure while compiling PprColour,

stgEqType: unequal
  PprColour
  [Char]
ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 8.3.20170815 for x86_64-unknown-linux):
	  *** Stg Lint ErrMsgs: in Stg2Stg ***
  compiler/utils/PprColour.hs:62:1: warning:
       [RHS of defaultScheme :: Scheme]
      In a RHS constructor application, con type doesn't match arg types:
      Constructor type:
          PprColour
          -> PprColour
          -> PprColour
          -> PprColour
          -> PprColour
          -> PprColour
          -> Scheme
      Arg types:
          [Char]
          PprColour
          String
          String
          String
          String
  *** Offending Program ***
...
Edited by Ben Gamari
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