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-rw-r--r--rts/Sanity.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/rts/Sanity.c b/rts/Sanity.c
index dcb6e5b5ea..25a76c0000 100644
--- a/rts/Sanity.c
+++ b/rts/Sanity.c
@@ -235,6 +235,9 @@ checkPAP (StgClosure *fun, StgClosure** payload, StgWord n_args)
n_args );
break;
}
+
+ ASSERT(fun_info->f.arity > TAG_MASK ? GET_CLOSURE_TAG(fun) == 1
+ : GET_CLOSURE_TAG(fun) == fun_info->f.arity);
}