diff options
Diffstat (limited to 'compiler/deSugar/DsBinds.hs')
| -rw-r--r-- | compiler/deSugar/DsBinds.hs | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/compiler/deSugar/DsBinds.hs b/compiler/deSugar/DsBinds.hs index 4a6a463b2d..cea7f3215b 100644 --- a/compiler/deSugar/DsBinds.hs +++ b/compiler/deSugar/DsBinds.hs @@ -29,7 +29,7 @@ import {-# SOURCE #-} Match( matchWrapper ) import DsMonad import DsGRHSs import DsUtils -import Check ( checkGuardMatches ) +import Check ( needToRunPmCheck, addTyCsDs, checkGuardMatches ) import HsSyn -- lots of things import CoreSyn -- lots of things @@ -186,11 +186,15 @@ dsHsBind dflags (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dicts , abs_exports = exports , abs_ev_binds = ev_binds , abs_binds = binds, abs_sig = has_sig }) - = do { ds_binds <- addDictsDs (listToBag dicts) $ - dsLHsBinds binds - -- addDictsDs: push type constraints deeper - -- for inner pattern match check - -- See Check, Note [Type and Term Equality Propagation] + = do { ds_binds <- applyWhen (needToRunPmCheck dflags FromSource) + -- FromSource might not be accurate, but at worst + -- we do superfluous calls to the pattern match + -- oracle. + -- addTyCsDs: push type constraints deeper + -- for inner pattern match check + -- See Check, Note [Type and Term Equality Propagation] + (addTyCsDs (listToBag dicts)) + (dsLHsBinds binds) ; ds_ev_binds <- dsTcEvBinds_s ev_binds |