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-rw-r--r--compiler/GHC/StgToCmm/Prim.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/GHC/StgToCmm/Prim.hs b/compiler/GHC/StgToCmm/Prim.hs
index 38cbd965b2..c29da653ba 100644
--- a/compiler/GHC/StgToCmm/Prim.hs
+++ b/compiler/GHC/StgToCmm/Prim.hs
@@ -1620,6 +1620,7 @@ emitPrimOp dflags primop = case primop of
TraceMarkerOp -> alwaysExternal
SetThreadAllocationCounter -> alwaysExternal
+ -- See Note [keepAlive# magic] in GHC.CoreToStg.Prep.
KeepAliveOp -> panic "keepAlive# should have been eliminated in CorePrep"
where