Verify polymorphic updates, name hygiene, and configuration combinations

Makefile

@@ -20,6 +20,8 @@ test: all
 	./runtime.byte
 	$(OCAMLC) -ppx ./rewrite fieldglass.cma record.ml -o record.byte
 	./record.byte
+	$(OCAMLC) -ppx ./rewrite fieldglass.cma case.ml -o case.byte
+	./case.byte
 	OCAMLC=$(OCAMLC) sh error.sh
 
 clean:

case.ml

@@ -0,0 +1,62 @@
+module Parameter = struct
+  type 'a t = { value : 'a; label : string } [@@fieldglass generate]
+end
+
+module Private = struct
+  type t = private { value : int }
+    [@@fieldglass generate ~no_set ~no_update ~no_lens]
+  let read : t -> int = value
+end
+
+module Universal = struct
+  type t = { apply : 'a. 'a -> 'a }
+    [@@fieldglass generate ~no_set ~no_update ~no_lens]
+end
+
+module Flags = struct
+  type t = { count : int }
+    [@@fieldglass generate ~no_get:false ~no_set:false ~no_update:false
+       ~no_lens:false ~just_lens:false ~self_arg_first:false
+       ~field_prefix_from_type:false ~func_no_named_arg:false]
+end
+
+module Group = struct
+  type left = { count : int } [@@fieldglass generate ~get_prefix:read]
+  and right = { size : int } [@@fieldglass generate ~field_prefix_from_type]
+end
+
+module Names = struct
+  type t = { __fg_source : int; __fg_value : string; __fg_function : bool }
+    [@@fieldglass generate ~field_prefix:local]
+end
+
+module Alias = struct
+  type original = { number : int; label : string }
+  type t = original = { number : int; label : string } [@@fieldglass generate]
+end
+
+module Unmarked = struct
+  type t = { number : int }
+  let number _ = 99
+end
+
+let () =
+  let original = Parameter.{ value = 3; label = "grey" } in
+  let changed = Parameter.set_value "three" original in
+  assert (changed = Parameter.{ value = "three"; label = "grey" });
+  assert (Parameter.update_value ~f:string_of_int original = Parameter.{ value = "3"; label = "grey" });
+  assert (Fieldglass.set Parameter._value "three" original = changed);
+  let identity = Universal.{ apply = fun value -> value } in
+  assert (Universal.apply identity 3 = 3);
+  assert (Universal.apply identity "grey" = "grey");
+  let count = Flags.{ count = 3 } in
+  assert (Flags.count (Flags.set_count 4 count) = 4);
+  assert (Flags.count (Flags.update_count ~f:succ count) = 4);
+  assert (Fieldglass.view Flags._count count = 3);
+  assert (Group.read_left_count Group.{ count = 3 } = 3);
+  assert (Group.read_right_size Group.{ size = 4 } = 4);
+  let names = Names.{ __fg_source = 3; __fg_value = "grey"; __fg_function = true } in
+  assert (Names.local_source names = 3);
+  assert (Names.local_value (Names.set_local_value "blue" names) = "blue");
+  assert (Alias.number (Alias.set_number 4 Alias.{ number = 3; label = "grey" }) = 4);
+  assert (Unmarked.number Unmarked.{ number = 3 } = 99)

error.sh

@@ -32,6 +32,13 @@ reject 'type a = { value : int } and b = { value : string } [@@fieldglass genera
 reject 'type t = private { colour : string } [@@fieldglass generate]' 'fieldglass: private records'
 reject "type t = { apply : 'a. 'a -> 'a } [@@fieldglass generate]" 'fieldglass: polymorphic fields'
 reject 'module type S = sig type t = { colour : string } [@@fieldglass generate] end' 'fieldglass: generate accessors in an implementation'
+reject 'type t = { item_type : int; item_value : int } [@@fieldglass generate]' 'fieldglass: invalid generated identifier'
+reject 'type t = { item_ : int; item_value : int } [@@fieldglass generate]' 'fieldglass: invalid generated identifier'
+reject 'type t = { value : int } [@@fieldglass generate ?no_get:None]' 'fieldglass: expected a labelled option'
+reject 'type t = { value : int } [@@fieldglass generate ~just_lens]
+let _ = set_value' 'Unbound value set_value'
+reject 'type t = { value : int } [@@fieldglass generate ~just_lens]
+let _ = update_value' 'Unbound value update_value'
 reject 'type t = { colour : string } [@@fieldglass generate ~no_set]
 let _ = set_colour' 'Unbound value set_colour'
 reject 'type t = { colour : string } [@@fieldglass generate ~no_update]