compiler: map `core::mem::swap` to the pure swap

In the pure functional model, `swap` is mostly about borrow checking and
should simplify to the pure swap in our backends.

Other backends than Lean are not done in this commit.

Signed-off-by: Ryan Lahfa <ryan.lahfa@inria.fr>

1 files changed, 2 insertions, 0 deletions

diff --git a/compiler/ExtractBuiltin.ml b/compiler/ExtractBuiltin.ml
index 3e96c320..531f1d8b 100644
--- a/compiler/ExtractBuiltin.ml
+++ b/compiler/ExtractBuiltin.ml
@@ -287,6 +287,7 @@ let builtin_funs () : (pattern * bool list option * builtin_fun_info) list =
   in
   [
     mk_fun "core::mem::replace" None None;
+    mk_fun "core::mem::swap" None None;
     mk_fun "core::slice::{[@T]}::len"
       (Some (backend_choice "slice::len" "Slice::len"))
       None;
@@ -517,6 +518,7 @@ let builtin_fun_effects =
       "alloc::vec::{alloc::vec::Vec<@T, alloc::alloc::Global>}::new";
       "alloc::vec::{alloc::vec::Vec<@T, @A>}::len";
       "core::mem::replace";
+      "core::mem::swap";
       "core::mem::take";
       "core::option::{core::option::Option<@T>}::take";
       "core::clone::impls::{core::clone::Clone<bool>}::clone";