Prep 0.15.13 (#4520)

* Update versions

* Regenerate changelog

CHANGELOG.md

@@ -2,6 +2,82 @@
 
 Notable changes to this project are documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.15.13
+
+New features:
+
+* Replace `UnusableDeclaration` with updated `NoInstanceFound` (#4513 by @JordanMartinez)
+
+  Previously, the following type class would be invalid
+  because there was no way for the compiler to infer
+  which type class instance to select because
+  the type variable in the class head `a` was
+  not mentioned in `bar`'s type signature:
+
+  ```purs
+  class Foo a where
+    bar :: Int
+  ```
+
+  The recently-added visible type applications (VTAs)
+  can now be used to guide the compiler in such cases:
+
+  ```purs
+  class Foo a where bar :: Int
+  instance Foo String where bar = 0
+  someInt = bar @String -- use the `String` instance
+  ```
+
+  Without VTAs, the compiler
+  will still produce an `InstanceNotFound` error, but this error 
+  has been updated to note which type variables in the class head
+  can only be disambiguated via visible type applications.
+  Given the following code
+
+  ```purs
+  class Single tyVarDoesNotAppearInBody where 
+    useSingle :: Int
+
+  single :: Int
+  single = useSingle
+  ```
+
+  The error reported for `useSingle` will be:
+
+  ```
+  No type class instance was found for
+
+    Main.Single t0
+
+  The instance head contains unknown type variables.
+  
+
+  Note: The following type class members found in the expression require visible type applications 
+  to be unambiguous (e.g. tyClassMember @Int).
+    Main.useSingle
+      tyNotAppearInBody
+  ```
+
+  For a multiparameter typeclass with functional dependencies...
+
+  ```purs
+  class MultiFdBidi a b | a -> b, b -> a where
+    useMultiFdBidi :: Int
+
+  multiFdBidi :: Int
+  multiFdBidi = useMultiFdBidi
+  ```
+
+  ...the "Note" part is updated to read
+  ```
+  Note: The following type class members found in the expression require visible type applications 
+  to be unambiguous (e.g. tyClassMember @Int).
+    Main.useMultiFdBidi
+      One of the following sets of type variables:
+        a
+        b
+  ```
+
 ## 0.15.12
 
 New features:

npm-package/package.json

@@ -1,6 +1,6 @@
 {
   "name": "purescript",
-  "version": "0.15.12",
+  "version": "0.15.13",
   "license": "ISC",
   "description": "PureScript wrapper that makes it available as a local dependency",
   "author": {
@@ -43,7 +43,7 @@
   ],
   "scripts": {
     "prepublishOnly": "node -e \"require('fs').copyFileSync('purs.bin.placeholder', 'purs.bin');\"",
-    "postinstall": "install-purescript --purs-ver=0.15.12",
+    "postinstall": "install-purescript --purs-ver=0.15.13",
     "test": "echo 'Error: no test specified' && exit 1"
   }
 }

purescript.cabal

@@ -2,7 +2,7 @@ cabal-version:  2.4
 
 name:           purescript
 -- Note: don't add prerelease identifiers here! Add them in app/Version.hs and npm-package/package.json instead.
-version:        0.15.12
+version:        0.15.13
 synopsis:       PureScript Programming Language Compiler
 description:    A small strongly, statically typed programming language with expressive types, inspired by Haskell and compiling to JavaScript.
 category:       Language