diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/reduction.ml | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/reduction.ml b/kernel/reduction.ml index d3168a9a17..55a7ca884b 100644 --- a/kernel/reduction.ml +++ b/kernel/reduction.ml @@ -183,9 +183,11 @@ type conv_pb = let sort_cmp pb s0 s1 cuniv = match (s0,s1) with - | (Prop c1, Prop c2) -> + | (Prop c1, Prop c2) when pb = CUMUL -> if c1 = Null or c2 = Pos then cuniv (* Prop <= Set *) else raise NotConvertible + | (Prop c1, Prop c2) -> + if c1 = c2 then cuniv else raise NotConvertible | (Prop c1, Type u) when pb = CUMUL -> assert (is_univ_variable u); cuniv | (Type u1, Type u2) -> assert (is_univ_variable u2); |