diff options
| -rw-r--r-- | proofs/clenv.ml | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/proofs/clenv.ml b/proofs/clenv.ml index 66b3bddb2..1fe882caf 100644 --- a/proofs/clenv.ml +++ b/proofs/clenv.ml @@ -388,7 +388,18 @@ let clenv_assign mv rhs clenv = error "clenv__assign: circularity in unification"; try (match Intmap.find mv clenv.env with - | Clval _ -> anomaly "clenv_assign: metavar already assigned" + | Clval (fls,ty) -> + if not (eq_constr fls.rebus rhs) then + try + (* Streams are lazy, force evaluation of id to catch Not_found*) + let id = Intmap.find mv clenv.namenv in + errorlabstrm "clenv_assign" + [< 'sTR "An incompatible instantiation has already been found for "; + pr_id id >] + with Not_found -> + anomaly "clenv_assign: non dependent metavar already assigned" + else + clenv | Cltyp bty -> { templval = clenv.templval; templtyp = clenv.templtyp; @@ -873,7 +884,7 @@ let clenv_match_args s clause = errorlabstrm "clenv_match_args" [< 'sTR "The variable "; pr_id s; 'sTR " occurs more than once in binding" >] - else + else clenv_lookup_name clause s | NoDep n -> if List.mem_assoc b t then errorlabstrm "clenv_match_args" |