Rotate release notes as part of the 0.57.0 release

.release-notes/0.57.0.md

@@ -0,0 +1,39 @@
+## Fix broken DTrace support
+
+Quite a while back, we broke the support in our Makefile for building the Pony runtime with support for DTrace. We've fixed that and added tests to assure it builds.
+
+## Fix compilation error when building with pool_memalign in release mode
+
+When attempting to build the Pony runtime with the `pool_memalign` option, users would encounter a compilation error if building a `release` rather than `debug` version of the runtime. We've fixed the compilation error and added CI testing to verify we don't get a regression.
+
+## Fix compiler bug that allows an unsafe data access pattern
+
+In November of last year, core team member Gordon Tisher identified a bug in the type system implementation that allowed sharing of data that shouldn't be shareable.
+
+The following code should not compile:
+
+```pony
+class Foo
+ let s: String box
+
+ new create(s': String box) =>
+ s = s'
+
+ fun get_s(): String val =>
+ // this is unsafe and shouldn't be allowed
+ recover val s end
+
+actor Main
+ new create(env: Env) =>
+ let s = String
+ s.append("world")
+ let foo = Foo(s)
+ env.out.print("hello " + foo.get_s())
+```
+
+Upon investigation, we found that this bug goes back about 8 or 9 years to the when viewpoint adaptation was introduced into the Pony compiler.
+
+We've fixed the logic flaw and added tests to verify that it can't be reintroduced.
+
+This will potentially break your code if you coded an unsafe recover block that the compiler previously allowed.
+

.release-notes/next-release.md

@@ -1,39 +0,0 @@
-## Fix broken DTrace support
-
-Quite a while back, we broke the support in our Makefile for building the Pony runtime with support for DTrace. We've fixed that and added tests to assure it builds.
-
-## Fix compilation error when building with pool_memalign in release mode
-
-When attempting to build the Pony runtime with the `pool_memalign` option, users would encounter a compilation error if building a `release` rather than `debug` version of the runtime. We've fixed the compilation error and added CI testing to verify we don't get a regression.
-
-## Fix compiler bug that allows an unsafe data access pattern
-
-In November of last year, core team member Gordon Tisher identified a bug in the type system implementation that allowed sharing of data that shouldn't be shareable.
-
-The following code should not compile:
-
-```pony
-class Foo
- let s: String box
-
- new create(s': String box) =>
- s = s'
-
- fun get_s(): String val =>
- // this is unsafe and shouldn't be allowed
- recover val s end
-
-actor Main
- new create(env: Env) =>
- let s = String
- s.append("world")
- let foo = Foo(s)
- env.out.print("hello " + foo.get_s())
-```
-
-Upon investigation, we found that this bug goes back about 8 or 9 years to the when viewpoint adaptation was introduced into the Pony compiler.
-
-We've fixed the logic flaw and added tests to verify that it can't be reintroduced.
-
-This will potentially break your code if you coded an unsafe recover block that the compiler previously allowed.
-