+ (case alts of
+ StgPrimAlts tc _ _ -> check_bndr tc
+ StgAlgAlts (Just tc) _ _ -> check_bndr tc
+ StgAlgAlts Nothing _ _ -> returnL ()
+ ) `thenL_`
+
+ (trace (showSDoc (ppr e)) $
+ -- we only allow case of tail-call or primop.
+ (case scrut of
+ StgApp _ _ -> returnL ()
+ StgConApp _ _ -> returnL ()
+ other -> addErrL (mkCaseOfCaseMsg e)) `thenL_`
+
+ addInScopeVars [bndr] (lintStgAlts alts scrut_ty)
+ )
+ where
+ scrut_ty = idType bndr
+ bad_bndr = mkDefltMsg bndr
+ check_bndr tc = case splitTyConApp_maybe scrut_ty of
+ Just (bndr_tc, _) -> checkL (tc == bndr_tc) bad_bndr
+ Nothing -> addErrL bad_bndr