Prepare for 12.0.0-alpha.15 release (#7619)

Author: cknitt

CHANGELOG.md

@@ -10,42 +10,23 @@
 > - :house: [Internal]
 > - :nail_care: [Polish]
 
-# 12.0.0-alpha.15 (Unreleased)
+# 12.0.0-alpha.15
 
 #### :boom: Breaking Change
 
 - New `rewatch` based build system. https://github.com/rescript-lang/rescript/pull/7551 https://github.com/rescript-lang/rescript/pull/7593
   - The new `rewatch` based build system is now the default and is exposed through the `rescript` command. The `rewatch` command has been removed.
   - The previous Ninja-based build system is now available via the `rescript legacy` subcommand.
   - Argument `--compiler-args` is now a subcommand `compiler-args`.
-- Remove `String.getSymbol` from standard library. https://github.com/rescript-lang/rescript/pull/7571
-- Remove `String.getSymbolUnsafe` from standard library. https://github.com/rescript-lang/rescript/pull/7571
-- Remove `String.setSymbol` from standard library. https://github.com/rescript-lang/rescript/pull/7571
-
-#### :rocket: New Feature
-
-- Add `OrThrow` aliases for `Belt` functions ending with `Exn`. https://github.com/rescript-lang/rescript/pull/7581, https://github.com/rescript-lang/rescript/pull/7590 The following aliases have been added:
-  - `Belt.Array.getOrThrow`
-  - `Belt.Array.setOrThrow`
-  - `Belt.Map.getOrThrow`
-  - `Belt.MutableMap.getOrThrow`
-  - `Belt.Set.getOrThrow`
-  - `Belt.MutableSet.getOrThrow`
-  - `Belt.List.getOrThrow`
-  - `Belt.List.tailOrThrow`
-  - `Belt.List.headOrThrow`
-  - `Belt.MutableQueue.peekOrThrow`
-  - `Belt.MutableQueue.popOrThrow`
-  - `Belt.Option.getOrThrow`
-  - `Belt.Result.getOrThrow`
+- Remove `String.getSymbol`, `String.getSymbolUnsafe`, `String.setSymbol` from standard library. https://github.com/rescript-lang/rescript/pull/7571
 
 #### :bug: Bug fix
 
 - Ignore inferred arity in functions inside `%raw` functions, leaving to `%ffi` the responsibility to check the arity since it gives an error in case of mismatch. https://github.com/rescript-lang/rescript/pull/7542
 - Pass the rewatch exit code through in wrapper script. https://github.com/rescript-lang/rescript/pull/7565
-- Prop punning when types don't match results in I/O error: _none_: No such file or directory. https://github.com/rescript-lang/rescript/pull/7533
+- Prop punning when types don't match results in `I/O error: _none_: No such file or directory`. https://github.com/rescript-lang/rescript/pull/7533
 - Pass location to children prop in jsx ppx. https://github.com/rescript-lang/rescript/pull/7540
-- Fix crash when `bs-g` is used with untagged variants. https://github.com/rescript-lang/rescript/pull/7575
+- Fix crash when `-bs-g` is used with untagged variants. https://github.com/rescript-lang/rescript/pull/7575
 - Fix issue with preserve mode where `jsx` is declared as an external without a `@module` attribute. https://github.com/rescript-lang/rescript/pull/7591
 - Rewatch: don't add deps to modules that are in packages that are not a dependency. https://github.com/rescript-lang/rescript/pull/7612
 - Rewatch: fix non-unicode stderr. https://github.com/rescript-lang/rescript/pull/7613
@@ -59,6 +40,20 @@
 - Better error messages for object field missing and object field type mismatches. https://github.com/rescript-lang/rescript/pull/7580
 - Better error messages for when polymorphic variants does not match for various reasons. https://github.com/rescript-lang/rescript/pull/7596
 - Improved completions for inline records. https://github.com/rescript-lang/rescript/pull/7601
+- Add `OrThrow` aliases for `Belt` functions ending with `Exn`. https://github.com/rescript-lang/rescript/pull/7581, https://github.com/rescript-lang/rescript/pull/7590 The following aliases have been added:
+  - `Belt.Array.getOrThrow`
+  - `Belt.Array.setOrThrow`
+  - `Belt.Map.getOrThrow`
+  - `Belt.MutableMap.getOrThrow`
+  - `Belt.Set.getOrThrow`
+  - `Belt.MutableSet.getOrThrow`
+  - `Belt.List.getOrThrow`
+  - `Belt.List.tailOrThrow`
+  - `Belt.List.headOrThrow`
+  - `Belt.MutableQueue.peekOrThrow`
+  - `Belt.MutableQueue.popOrThrow`
+  - `Belt.Option.getOrThrow`
+  - `Belt.Result.getOrThrow`
 
 #### :house: Internal