fix noxfile and ban abi3t builds on 3.14 and older

Author: ngoldbaum

noxfile.py

@@ -142,7 +142,7 @@ def test_rust(session: nox.Session):
 
         if (
             feature_set
-            and "abi3" in feature_set
+            and "abi3t" in feature_set
             and "full" in feature_set
             and sys.version_info >= (3, 16)
         ):
@@ -1545,7 +1545,9 @@ def _get_feature_sets() -> Tuple[Optional[str], ...]:
             return (None, features)
 
     # do fewer abi3t builds?
-    return (None, "abi3", "abi3t", features, f"abi3,{features}", f"abi3t,{features}")
+    if sys.version_info >= (3, 15):
+        return (None, "abi3", "abi3t", features, f"abi3,{features}", f"abi3t,{features}")
+    return (None, "abi3", features, f"abi3,{features}")
 
 
 _RELEASE_LINE_START = "release: "

pyo3-build-config/src/impl_.rs

@@ -371,6 +371,13 @@ print("gil_disabled", get_config_var("Py_GIL_DISABLED"))
 
         let stable_abi = CPythonABI::from_build_env()?;
 
+        if let CPythonABI::ABI3t = stable_abi {
+            ensure!(
+                version.minor > 14,
+                "abi3t is supported on Python 3.15 and newer but build is for Python {version}"
+            );
+        }
+
         let implementation = map["implementation"].parse()?;
 
         let gil_disabled = match map["gil_disabled"].as_str() {