Disallow @cfunc together with @ccall on the same function.

2 files changed, 22 insertions, 0 deletions

diff --git a/Cython/Compiler/ParseTreeTransforms.py b/Cython/Compiler/ParseTreeTransforms.py
index 1ef6c2112..d90ea4391 100644
--- a/Cython/Compiler/ParseTreeTransforms.py
+++ b/Cython/Compiler/ParseTreeTransforms.py
@@ -2894,6 +2894,8 @@ class AdjustDefByDirectives(CythonTransform, SkipDeclarations):
             # backward compatible default: no exception check, unless there's also a "@returns" declaration
             except_val = (None, True if return_type_node else False)
         if 'ccall' in self.directives:
+            if 'cfunc' in self.directives:
+                error(node.pos, "cfunc and ccall directives cannot be combined")
             node = node.as_cfunction(
                 overridable=True, modifiers=modifiers, nogil=nogil,
                 returns=return_type_node, except_val=except_val)
diff --git a/tests/errors/pure_errors.py b/tests/errors/pure_errors.py
index b153bd2e6..a480d7abe 100644
--- a/tests/errors/pure_errors.py
+++ b/tests/errors/pure_errors.py
@@ -56,9 +56,29 @@ def test_cdef_return_object_broken(x: object) -> object:
     return x
 
 
+@cython.ccall
+@cython.cfunc
+def test_contradicting_decorators1(x: object) -> object:
+    return x
+
+
+@cython.cfunc
+@cython.ccall
+def test_contradicting_decorators2(x: object) -> object:
+    return x
+
+
 _ERRORS = """
 44:22: Calling gil-requiring function not allowed without gil
 45:24: Calling gil-requiring function not allowed without gil
 48:0: Python functions cannot be declared 'nogil'
 53:0: Exception clause not allowed for function returning Python object
+59:0: cfunc and ccall directives cannot be combined
+65:0: cfunc and ccall directives cannot be combined
+"""
+
+_WARNINGS = """
+# bugs:
+59:0: 'test_contradicting_decorators1' redeclared
+65:0: 'test_contradicting_decorators2' redeclared
 """