diff options
Diffstat (limited to 'src/elab_ops.sml')
| -rw-r--r-- | src/elab_ops.sml | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/elab_ops.sml b/src/elab_ops.sml index a26ba17d..b5292e9b 100644 --- a/src/elab_ops.sml +++ b/src/elab_ops.sml @@ -131,6 +131,18 @@ fun subStrInSgn (m1, m2) = sgn_item = fn sgi => sgi, sgn = fn sgn => sgn} +val occurs = + U.Con.existsB {kind = fn _ => false, + con = fn (n, c) => + case c of + CRel n' => n' = n + | _ => false, + bind = fn (n, b) => + case b of + U.Con.RelC _ => n + 1 + | _ => n} + 0 + fun hnormCon env (cAll as (c, loc)) = case c of @@ -156,6 +168,16 @@ fun hnormCon env (cAll as (c, loc)) = | SOME (_, SOME c) => hnormCon env c end + (* Eta reduction *) + | CAbs (x, k, b) => + (case #1 (hnormCon (E.pushCRel env x k) b) of + CApp (f, (CRel 0, _)) => + if occurs f then + cAll + else + hnormCon env (subConInCon (0, (CUnit, loc)) f) + | _ => cAll) + | CApp (c1, c2) => (case #1 (hnormCon env c1) of CAbs (x, k, cb) => |