diff options
| -rw-r--r-- | compiler/GHC/Core/SimpleOpt.hs | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/compiler/GHC/Core/SimpleOpt.hs b/compiler/GHC/Core/SimpleOpt.hs index 16906df1c1..abc1968b1b 100644 --- a/compiler/GHC/Core/SimpleOpt.hs +++ b/compiler/GHC/Core/SimpleOpt.hs @@ -1174,7 +1174,12 @@ exprIsConApp_maybe (in_scope, id_unf) expr -- Look through dictionary functions; see Note [Unfolding DFuns] | DFunUnfolding { df_bndrs = bndrs, df_con = con, df_args = dfun_args } <- unfolding , bndrs `equalLength` args -- See Note [DFun arity check] - , let subst = mkOpenSubst in_scope (bndrs `zip` args) + , let in_scope' = extend_in_scope (exprsFreeVars dfun_args) + subst = mkOpenSubst in_scope' (bndrs `zip` args) + -- We extend the in-scope set here to silence warnings from + -- substExpr when it finds not-in-scope Ids in dfun_args. + -- simplOptExpr initialises the in-scope set with exprFreeVars, + -- but that doesn't account for DFun unfoldings = succeedWith in_scope floats $ pushCoDataCon con (map (substExpr subst) dfun_args) co @@ -1185,7 +1190,7 @@ exprIsConApp_maybe (in_scope, id_unf) expr -- CPR'd workers getting inlined back into their wrappers, | idArity fun == 0 , Just rhs <- expandUnfolding_maybe unfolding - , let in_scope' = extendInScopeSetSet in_scope (exprFreeVars rhs) + , let in_scope' = extend_in_scope (exprFreeVars rhs) = go (Left in_scope') floats rhs cont -- See Note [exprIsConApp_maybe on literal strings] @@ -1197,6 +1202,9 @@ exprIsConApp_maybe (in_scope, id_unf) expr dealWithStringLiteral fun str co where unfolding = id_unf fun + extend_in_scope unf_fvs + | isLocalId fun = in_scope `extendInScopeSetSet` unf_fvs + | otherwise = in_scope go _ _ _ _ = Nothing |