relax balanced apostrophe for ocaml and rust

lib/matchers/languages.ml

@@ -8,6 +8,7 @@ module Dyck = struct
 
     let escapable_string_literals = []
 
+    (* This is ignored since there are no literals *)
     let escape_char =
       '\\'
 
@@ -290,6 +291,12 @@ module Rust = struct
   module Syntax = struct
     include Swift.Syntax
 
+    (* Override ' as escapable string literal, since
+       these can be used in typing *)
+    let escapable_string_literals =
+      [ {|"|}
+      ]
+
     let raw_string_literals =
       [ ({|r#|}, {|#|})
       ]
@@ -303,6 +310,12 @@ module OCaml = struct
     open Types
     include Generic.Syntax
 
+    (* Override ' as escapable string literal, since
+       these can be used in typing *)
+    let escapable_string_literals =
+      [ {|"|}
+      ]
+
     let raw_string_literals =
       [ ("{|", "|}")
       ]

test/dune

@@ -13,6 +13,7 @@
   test_c_style_comments
   test_c_separators
   test_string_literals
+  test_special_matcher_cases
   test_generic
   test_rewrite_parts
   test_rewrite_rule

test/test_special_matcher_cases.ml

@@ -0,0 +1,32 @@
+open Core
+
+open Matchers
+open Rewriter
+
+let configuration = Configuration.create ~match_kind:Fuzzy ()
+
+
+let run ?(configuration = configuration) (module M : Matchers.Matcher) source match_template rewrite_template =
+  M.all ~configuration ~template:match_template ~source
+  |> function
+  | [] -> print_string "No matches."
+  | results ->
+    Option.value_exn (Rewrite.all ~source ~rewrite_template results)
+    |> (fun { rewritten_source; _ } -> rewritten_source)
+    |> print_string
+
+let%expect_test "parse_rust_apostrophe_ok" =
+  let source = {|pub struct GlobBuilder<'a> {}|} in
+  let match_template = {|{}|} in
+  let rewrite_template = {|{} // success|} in
+
+  run (module Matchers.Rust) source match_template rewrite_template;
+  [%expect_exact {|pub struct GlobBuilder<'a> {} // success|}]
+
+let%expect_test "parse_ocaml_apostrophe_ok" =
+  let source = {|type 'a t = Poly of 'a | Int of int |} in
+  let match_template = {|type :[v] t = :[_] Int of :[i]|} in
+  let rewrite_template = {|:[v], :[i]|} in
+
+  run (module Matchers.OCaml) source match_template rewrite_template;
+  [%expect_exact {|'a, int |}]