Update to work with ponyc 0.73.0

.github/workflows/pony-lint.yml

@@ -17,7 +17,7 @@ jobs:
     name: Lint Pony source
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/shared-docker-ci-standard-builder:release
+      image: ghcr.io/ponylang/shared-docker-ci-standard-builder:nightly
     steps:
       - uses: actions/checkout@v6.0.2
       - name: Lint

.github/workflows/pr.yml

@@ -21,7 +21,7 @@ jobs:
     name: Test against recent ponyc release
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/shared-docker-ci-standard-builder:release
+      image: ghcr.io/ponylang/shared-docker-ci-standard-builder:nightly
     steps:
       - uses: actions/checkout@v6.0.2
       - name: Test

.release-notes/update-to-ponyc-0.73.0.md

@@ -0,0 +1,3 @@
+## Update to work with ponyc 0.73.0
+
+The `exit` C FFI declaration in our internal `_Fail` primitive used the wrong parameter type. It declared the status parameter as `U8` instead of `I32`, which didn't match the C `exit()` function's actual `int` parameter type.

README.md

@@ -8,6 +8,7 @@ fork_join is a beta-level project. The API might change going forward based on f
 
 ## Installation
 
+* Requires ponyc 0.73.0 or later.
 * Install [corral](https://github.com/ponylang/corral)
 * `corral add github.com/ponylang/fork_join.git --version 0.1.1`
 * `corral fetch` to fetch your dependencies

fork_join/_fail.pony

@@ -1,4 +1,4 @@
-use @exit[None](status: U8)
+use @exit[None](status: I32)
 use @fprintf[I32](stream: Pointer[U8] tag, fmt: Pointer[U8] tag, ...)
 use @pony_os_stderr[Pointer[U8]]()