diff options
| author |  Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2017-02-27 12:12:35 +0100 |
|---|---|---|
| committer | Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2018-03-27 13:25:54 +0200 |
| commit | 4fba4b00257e8ddbc94f71115d139bfc2483944d (patch) | |
| tree | 77338ae34ec87c6697e6bcfc94792c7c25899af1 /kernel/esubst.mli | |
| parent | 01b7de3a673eb89cea61442c4db721aad9520c9f (diff) | |
Expliciting and taking advantage of a representation invariant in Esubst.
Diffstat (limited to 'kernel/esubst.mli')
| -rw-r--r-- | kernel/esubst.mli | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/esubst.mli b/kernel/esubst.mli index b82d6fdf0..a674c425a 100644 --- a/kernel/esubst.mli +++ b/kernel/esubst.mli @@ -56,7 +56,11 @@ val comp : ('a subs * 'a -> 'a) -> 'a subs -> 'a subs -> 'a subs (** {6 Compact representation } *) (** Compact representation of explicit relocations - [ELSHFT(l,n)] == lift of [n], then apply [lift l]. - - [ELLFT(n,l)] == apply [l] to de Bruijn > [n] i.e under n binders. *) + - [ELLFT(n,l)] == apply [l] to de Bruijn > [n] i.e under n binders. + + Invariant ensured by the private flag: no lift contains two consecutive + [ELSHFT] nor two consecutive [ELLFT]. +*) type lift = private | ELID | ELSHFT of lift * int |