commit 7f46c2d22a87b99c70a220c1b13aaa34c6d217ff (HEAD, origin/upgrade-ppxlib-0.18.0)
Author: Nathan Rebours <nathan.p.rebours@gmail.com>
Date:   Mon Oct 5 17:46:34 2020 +0200

    Make ppx_expect compatible with ppxlib.0.18.0
    
    ppxlib.0.18.0 upgrades to the 4.11 AST which results in a change
    in string constants representation. This PR makes ppx_expect
    compatible with the latest ppxlib.
    
    You might want for the actual release of ppxlib.0.18.0 before merging
    this!
    
    Signed-off-by: Nathan Rebours <nathan.p.rebours@gmail.com>

diff --git a/expect_payload/ppx_expect_payload.ml b/expect_payload/ppx_expect_payload.ml
index 23a12e1..fd2a5bb 100644
--- a/expect_payload/ppx_expect_payload.ml
+++ b/expect_payload/ppx_expect_payload.ml
@@ -86,7 +86,7 @@ let make ~kind payload ~(extension_id_loc : Location.t) =
 let pattern () =
   Ast_pattern.(
     map
-      (single_expr_payload (pexp_loc __ (pexp_constant (pconst_string __ __))))
-      ~f:(fun f loc s tag -> f (Some (loc, s, tag)))
+      (single_expr_payload (pexp_loc __ (pexp_constant (pconst_string __ __ __))))
+      ~f:(fun f loc s _loc tag -> f (Some (loc, s, tag)))
     ||| map (pstr nil) ~f:(fun f -> f None))
 ;;
diff --git a/ppx_expect.opam b/ppx_expect.opam
index dcce541..59adadb 100644
--- a/ppx_expect.opam
+++ b/ppx_expect.opam
@@ -17,7 +17,7 @@ depends: [
   "ppx_inline_test" {>= "v0.14" & < "v0.15"}
   "stdio"           {>= "v0.14" & < "v0.15"}
   "dune"            {>= "2.0.0"}
-  "ppxlib"          {>= "0.11.0"}
+  "ppxlib"          {>= "0.18.0"}
   "re"              {>= "1.8.0"}
 ]
 synopsis: "Cram like framework for OCaml"