Simplify version handling of UI tests.

Due to checking in error outputs these tests only work reliably on stable and
not on intermediate version between our MSRV (currently 1.48) and the current
stable version.

Hence this simplifies things to run only MSRV-compatible tests for the MSRV
builds, anything else for stable builds except for those tests which require the
nightly feature, i.e. the `Ungil` being distinct from the `Send` trait.

Finally, `not_send3` is disabled when using the nightly feature since while `Rc`
is not send, it also not GIL-bound and hence can be passed into `allow_threads`
as it does not actually spawn a new thread.

.github/workflows/build.yml

@@ -59,6 +59,10 @@ jobs:
         name: Prepare minimal package versions (MSRV only)
         run: nox -s set-minimal-package-versions
 
+      - if: inputs.rust == 'nightly'
+        name: Ignore changed error messages when using trybuild
+        run: echo "TRYBUILD=overwrite" >> "$GITHUB_ENV"
+
       - name: Build docs
         run: cargo doc --no-deps --no-default-features --features "full ${{ inputs.extra-features }}"
 

tests/test_compile_error.rs

@@ -1,35 +1,8 @@
 #![cfg(feature = "macros")]
 
-#[rustversion::not(nightly)]
 #[cfg(not(target_arch = "wasm32"))] // Not possible to invoke compiler from wasm
 #[test]
 fn test_compile_errors() {
-    // stable - require all tests to pass
-    _test_compile_errors()
-}
-
-#[cfg(not(feature = "nightly"))]
-#[cfg(not(target_arch = "wasm32"))] // We are building wasm Python with pthreads disabled
-#[rustversion::nightly]
-#[test]
-fn test_compile_errors() {
-    // nightly - don't care if test output is potentially wrong, to avoid churn in PyO3's CI thanks
-    // to diagnostics changing on nightly.
-    let _ = std::panic::catch_unwind(_test_compile_errors);
-}
-
-#[cfg(feature = "nightly")]
-#[cfg(not(target_arch = "wasm32"))] // Not possible to invoke compiler from wasm
-#[rustversion::nightly]
-#[test]
-fn test_compile_errors() {
-    // nightly - don't care if test output is potentially wrong, to avoid churn in PyO3's CI thanks
-    // to diagnostics changing on nightly.
-    _test_compile_errors()
-}
-
-#[cfg(not(feature = "nightly"))]
-fn _test_compile_errors() {
     let t = trybuild::TestCases::new();
 
     t.compile_fail("tests/ui/invalid_macro_args.rs");
@@ -46,89 +19,44 @@ fn _test_compile_errors() {
     t.compile_fail("tests/ui/invalid_pymodule_args.rs");
     t.compile_fail("tests/ui/reject_generics.rs");
 
-    tests_rust_1_49(&t);
-    tests_rust_1_56(&t);
-    tests_rust_1_57(&t);
-    tests_rust_1_58(&t);
-    tests_rust_1_60(&t);
-    tests_rust_1_62(&t);
-    tests_rust_1_63(&t);
+    tests_not_msrv(&t);
+    tests_nightly(&t);
 
     #[rustversion::since(1.49)]
-    fn tests_rust_1_49(t: &trybuild::TestCases) {
+    fn tests_not_msrv(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/deprecations.rs");
-    }
-    #[rustversion::before(1.49)]
-    fn tests_rust_1_49(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.56)]
-    fn tests_rust_1_56(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_closure.rs");
-
         t.compile_fail("tests/ui/pyclass_send.rs");
-    }
-
-    #[rustversion::before(1.56)]
-    fn tests_rust_1_56(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.57)]
-    fn tests_rust_1_57(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_argument_attributes.rs");
         t.compile_fail("tests/ui/invalid_frompy_derive.rs");
         t.compile_fail("tests/ui/static_ref.rs");
         t.compile_fail("tests/ui/wrong_aspyref_lifetimes.rs");
-    }
-
-    #[rustversion::before(1.57)]
-    fn tests_rust_1_57(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.58)]
-    fn tests_rust_1_58(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_pyfunctions.rs");
         t.compile_fail("tests/ui/invalid_pymethods.rs");
         #[cfg(Py_LIMITED_API)]
         t.compile_fail("tests/ui/abi3_nativetype_inheritance.rs");
-    }
-
-    #[rustversion::before(1.58)]
-    fn tests_rust_1_58(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.60)]
-    fn tests_rust_1_60(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_intern_arg.rs");
         t.compile_fail("tests/ui/invalid_frozen_pyclass_borrow.rs");
-    }
-
-    #[rustversion::before(1.60)]
-    fn tests_rust_1_60(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.62)]
-    fn tests_rust_1_62(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_pymethod_receiver.rs");
         t.compile_fail("tests/ui/missing_intopy.rs");
-    }
-
-    #[rustversion::before(1.62)]
-    fn tests_rust_1_62(_t: &trybuild::TestCases) {}
-
-    #[rustversion::since(1.63)]
-    fn tests_rust_1_63(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_result_conversion.rs");
         t.compile_fail("tests/ui/not_send.rs");
         t.compile_fail("tests/ui/not_send2.rs");
+        #[cfg(not(feature = "nightly"))]
         t.compile_fail("tests/ui/not_send3.rs");
         t.compile_fail("tests/ui/get_set_all.rs");
     }
 
-    #[rustversion::before(1.63)]
-    fn tests_rust_1_63(_t: &trybuild::TestCases) {}
-}
+    #[rustversion::before(1.49)]
+    fn tests_not_msrv(_t: &trybuild::TestCases) {}
 
-#[cfg(feature = "nightly")]
-fn _test_compile_errors() {
-    let t = trybuild::TestCases::new();
+    #[cfg(feature = "nightly")]
+    fn tests_nightly(t: &trybuild::TestCases) {
+        t.compile_fail("tests/ui/not_send_auto_trait.rs");
+        t.compile_fail("tests/ui/not_send_auto_trait2.rs");
+        t.compile_fail("tests/ui/send_wrapper.rs");
+    }
 
-    t.compile_fail("tests/ui/not_send_auto_trait.rs");
-    t.compile_fail("tests/ui/not_send_auto_trait2.rs");
-    t.compile_fail("tests/ui/send_wrapper.rs");
+    #[cfg(not(feature = "nightly"))]
+    fn tests_nightly(_t: &trybuild::TestCases) {}
 }