Library Ltac2.Ltac1


This module defines the Ltac2 FFI to Ltac1 code. Due to intricate semantics of the latter, the functions described here are voluntarily under-specified. Not for the casual user, handle with care and expect undefined behaviours otherwise.

Require Import Ltac2.Init.

Ltac2 Type t.
Dynamically-typed Ltac1 values.

Ltac2 @ external ref : ident list -> t := "ltac2" "ltac1_ref".
Returns the Ltac1 definition with the given absolute name.

Ltac2 @ external run : t -> unit := "ltac2" "ltac1_run".
Runs an Ltac1 value, assuming it is a 'tactic', i.e. not returning anything.

Ltac2 @ external lambda : (t -> t) -> t := "ltac2" "ltac1_lambda".
Embed an Ltac2 function into Ltac1 values. Contrarily to the ltac1:(...) quotation, this function allows both to capture an Ltac2 context inside the closure and to return an Ltac1 value. Returning values in Ltac1 is a intrepid endeavour prone to weird runtime semantics.

Ltac2 @ external apply : t -> t list -> (t -> unit) -> unit := "ltac2" "ltac1_apply".
Applies an Ltac1 value to a list of arguments, and provides the result in CPS style. It does **not** run the returned value.
Conversion functions

Ltac2 @ external of_constr : constr -> t := "ltac2" "ltac1_of_constr".
Ltac2 @ external to_constr : t -> constr option := "ltac2" "ltac1_to_constr".

Ltac2 @ external of_ident : ident -> t := "ltac2" "ltac1_of_ident".
Ltac2 @ external to_ident : t -> ident option := "ltac2" "ltac1_to_ident".

Ltac2 @ external of_list : t list -> t := "ltac2" "ltac1_of_list".
Ltac2 @ external to_list : t -> t list option := "ltac2" "ltac1_to_list".