diff options
| -rw-r--r-- | tactics/equality.ml | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/tactics/equality.ml b/tactics/equality.ml index 338addc4df..fdd02fe92e 100644 --- a/tactics/equality.ml +++ b/tactics/equality.ml @@ -638,15 +638,23 @@ let sig_clausale_forme env sigma sort_of_ty siglen ty (dFLT,dFLTty) = let headpat = nf_betadeltaiota env sigma ty in let nf_ty = nf_betadeltaiota env sigma dFLTty in let bindings = - list_try_find - (fun ty -> - try - (* Test inutile car somatch ne prend pas en compte les univers *) - if is_Type headpat & is_Type ty then - [] - else - matches (pattern_of_constr headpat) ty - with PatternMatchingFailure -> failwith "caught") + (* Test inutile car somatch ne prend pas en compte les univers *) + if is_Type headpat & is_Type nf_ty then + [] + else + let headpat = pattern_of_constr headpat in + let weakpat = pattern_of_constr (nf_betaiota ty) in + list_try_find + (fun ty -> + try + matches headpat ty + with PatternMatchingFailure -> + try + (* Needed in cases such as pat=([x]T ?) and ty=(T C) + with T reducible against constructor C *) + matches weakpat ty + with PatternMatchingFailure -> + failwith "caught") [dFLTty; nf_ty] in (bindings,dFLT) |