[198 of 577] Compiling IfaceSyn         ( ghc/compiler/iface/IfaceSyn.hs, dist/build/IfaceSyn.o, dist/build/IfaceSyn.dyn_o )
[199 of 577] Compiling StgSubst         ( ghc/compiler/stgSyn/StgSubst.hs, dist/build/StgSubst.o, dist/build/StgSubst.dyn_o )
[200 of 577] Compiling PrimOp           ( ghc/compiler/prelude/PrimOp.hs, dist/build/PrimOp.o, dist/build/PrimOp.dyn_o )

ghc/compiler/prelude/PrimOp.hs:96:1: error:
    parse error (possibly incorrect indentation or mismatched brackets)
   |
96 | tagToEnumKey :: Unique
   | ^
cabal: Failed to build ghcjs-8.10.7 (which is required by exe:haddock from
ghcjs-8.10.7, exe:ghcjs-pkg from ghcjs-8.10.7 and others). See the build log
above for details.