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Diffstat (limited to 'compiler/GHC/Rename/Module.hs')
| -rw-r--r-- | compiler/GHC/Rename/Module.hs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/GHC/Rename/Module.hs b/compiler/GHC/Rename/Module.hs index fc6846e566..50792c1c95 100644 --- a/compiler/GHC/Rename/Module.hs +++ b/compiler/GHC/Rename/Module.hs @@ -604,7 +604,8 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds , cid_datafam_insts = adts }) = do { checkInferredVars ctxt inf_err inst_ty ; (inst_ty', inst_fvs) <- rnHsSigType ctxt TypeLevel inst_ty - ; let (ktv_names, _, head_ty') = splitLHsInstDeclTy inst_ty' + ; let (ktv_bndrs, _, head_ty') = splitLHsInstDeclTy inst_ty' + ktv_names = hsOuterTyVarNames ktv_bndrs -- Check if there are any nested `forall`s or contexts, which are -- illegal in the type of an instance declaration (see -- Note [No nested foralls or contexts in instance types] in |