Retain MIT-licensed Flow collection sources

Signed-off-by: Christoph Knittel <ck@cca.io>

Author: cknitt

compiler/flow_parser/README.md

@@ -4,10 +4,17 @@ This directory contains the OCaml Flow parser used by the ReScript compiler.
 
 - Upstream repository: https://github.com/facebook/flow
 - Flow parser version: `0.320.0`
-- Source commit: `7c64d4b077bc6fc45c12cee3cfa7368fdb2186ce`
+- Parser and Sedlex source commit: `7c64d4b077bc6fc45c12cee3cfa7368fdb2186ce`
+- Collection source commit: `9ea4062c0b7e037415c4413a7634c459ebd5c31b`
+  from Flow parser 0.267.0
 - Original source directories: `src/parser`, `src/third-party/sedlex`,
   `src/third-party/sedlex-ppx`, and `src/hack_forked/utils/collections`
 
+The collection helpers retain the MIT-licensed 0.267.0 sources. Their code is
+identical in Flow 0.320.0, but that release replaces their MIT notices with
+"Confidential and proprietary" notices that do not grant redistribution
+rights.
+
 The Dune files were adapted to build these sources as private libraries inside
 the ReScript repository. Sources used only by the upstream JavaScript and C API
 targets are not included. One ambiguous Sedlex documentation comment was
@@ -18,5 +25,6 @@ call uses an empty-list comparison to retain OCaml 5.0 compatibility.
 Vendored sources are excluded from the repository-wide OCamlformat check so
 that they remain comparable with their upstream versions.
 
-The Flow sources are licensed under the MIT licence in `LICENSE`. Vendored
-Sedlex and collections sources retain their own licence files.
+The Flow parser and retained collection sources are licensed under the MIT
+licence in `LICENSE` and their source headers. Vendored Sedlex and collection
+third-party sources retain the licence files in their respective directories.

compiler/flow_parser/collections/iMap.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 include WrappedMap.Make (IntKey)
 

compiler/flow_parser/collections/iSet.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 include Flow_set.Make (IntKey)
 

compiler/flow_parser/collections/immQueue.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 type 'a t = {
   incoming: 'a list;

compiler/flow_parser/collections/immQueue.mli

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 (*
  * Immutable queue implementation. Modeled loosely after the mutable stdlib

compiler/flow_parser/collections/intKey.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 type t = int
 

compiler/flow_parser/collections/priorityQueue.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 module Make (Ord : Set.OrderedType) = struct
   type elt = Ord.t

compiler/flow_parser/collections/sMap.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 include WrappedMap.Make (StringKey)
 

compiler/flow_parser/collections/sSet.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 include Flow_set.Make (StringKey)
 

compiler/flow_parser/collections/stringKey.ml

@@ -1,4 +1,9 @@
-(* (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary. *)
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
 
 type t = string