diff options
Diffstat (limited to 'pretyping/evarutil.ml')
| -rw-r--r-- | pretyping/evarutil.ml | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/pretyping/evarutil.ml b/pretyping/evarutil.ml index 13ccefe1e..f7b4e1279 100644 --- a/pretyping/evarutil.ml +++ b/pretyping/evarutil.ml @@ -857,6 +857,7 @@ let rec invert_definition env evd (evk,argsv as ev) rhs = | Rel i when i>k -> project_variable env' (mkRel (i-k)) k t | Var id -> project_variable env' t k t | Evar (evk',args' as ev') -> + if evk = evk' then error_occur_check env (evars_of evd) evk rhs; (* Evar/Evar problem (but left evar is virtual) *) let projs' = array_map_to_list @@ -904,6 +905,8 @@ and evar_define env (evk,_ as ev) rhs evd = try let (evd',body) = invert_definition env evd ev rhs in if occur_meta body then error "Meta cannot occur in evar body"; + (* invert_definition may have instantiate some evars of rhs with evk *) + (* so we recheck acyclicity *) if occur_evar evk body then error_occur_check env (evars_of evd) evk body; (* needed only if an inferred type *) let body = refresh_universes body in |