numpy
diff --git a/‎.github/workflows/mypy.yml
Lines changed: 18 additions & 0 deletions b/‎.github/workflows/mypy.yml
Lines changed: 18 additions & 0 deletions
diff --git a/‎numpy/_core/include/numpy/npy_3kcompat.h
Lines changed: 1 addition & 1 deletion b/‎numpy/_core/include/numpy/npy_3kcompat.h
Lines changed: 1 addition & 1 deletion
diff --git a/‎numpy/_core/src/common/npy_cpu_dispatch.c
Lines changed: 1 addition & 1 deletion b/‎numpy/_core/src/common/npy_cpu_dispatch.c
Lines changed: 1 addition & 1 deletion
diff --git a/‎numpy/_core/src/common/pythoncapi-compat b/‎numpy/_core/src/common/pythoncapi-compat
@@ -72,3 +72,21 @@ jobs:
     - name: Run Mypy
       run: |
         spin mypy
+  # This job checks for suspicious C API usage that may break nogil compatibility.
+  # It scans PR diffs for dangerous borrowed-referenced calls and fails if any are found.
+  lint-capi:
+    # To enable this workflow on a fork, comment out:
+    if: github.repository == 'numpy/numpy'
+    name: "C API Borrowed Ref Lint"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          submodules: recursive
+      - name: Run API Borrowed Ref Linter 
+        run: |
+          pip install -r requirements/build_requirements.txt
+          pip install -r requirements/test_requirements.txt
+          pip install ruff
+          spin lint
@@ -242,7 +242,7 @@ static inline PyObject*
 npy_PyFile_OpenFile(PyObject *filename, const char *mode)
 {
     PyObject *open;
-    open = PyDict_GetItemString(PyEval_GetBuiltins(), "open");
+    open = PyDict_GetItemString(PyEval_GetBuiltins(), "open"); // noqa: borrowed-ref OK
     if (open == NULL) {
         return NULL;
     }
 
@@ -33,7 +33,7 @@ NPY_VISIBILITY_HIDDEN void
 npy_cpu_dispatch_trace(const char *fname, const char *signature,
                        const char **dispatch_info)
 {
-    PyObject *func_dict = PyDict_GetItemString(npy_static_pydata.cpu_dispatch_registry, fname);
+    PyObject *func_dict = PyDict_GetItemString(npy_static_pydata.cpu_dispatch_registry, fname); // noqa: borrowed-ref OK
     if (func_dict == NULL) {
         func_dict = PyDict_New();
         if (func_dict == NULL) {
Original file line number	Diff line number	Diff line change
`@@ -242,7 +242,7 @@ static inline PyObject*`
`242`	`242`	`npy_PyFile_OpenFile(PyObject filename, const char mode)`
`243`	`243`	`{`
`244`	`244`	`PyObject *open;`
`245`		`- open = PyDict_GetItemString(PyEval_GetBuiltins(), "open");`
	`245`	`+ open = PyDict_GetItemString(PyEval_GetBuiltins(), "open"); // noqa: borrowed-ref OK`
`246`	`246`	`if (open == NULL) {`
`247`	`247`	`return NULL;`
`248`	`248`	`}`
Original file line number	Diff line number	Diff line change
`@@ -33,7 +33,7 @@ NPY_VISIBILITY_HIDDEN void`
`33`	`33`	`npy_cpu_dispatch_trace(const char fname, const char signature,`
`34`	`34`	`const char **dispatch_info)`
`35`	`35`	`{`
`36`		`- PyObject *func_dict = PyDict_GetItemString(npy_static_pydata.cpu_dispatch_registry, fname);`
	`36`	`+ PyObject *func_dict = PyDict_GetItemString(npy_static_pydata.cpu_dispatch_registry, fname); // noqa: borrowed-ref OK`
`37`	`37`	`if (func_dict == NULL) {`
`38`	`38`	`func_dict = PyDict_New();`
`39`	`39`	`if (func_dict == NULL) {`