Disallowing type aliases.

dace/frontend/python/newast.py

@@ -303,7 +303,7 @@ def repl_callback(repldict):
 # Extra AST node types that are disallowed after preprocessing
 _DISALLOWED_STMTS = DISALLOWED_STMTS + [
     'Global', 'Assert', 'Print', 'Nonlocal', 'Raise', 'Starred', 'AsyncFor', 'ListComp', 'GeneratorExp', 'SetComp',
-    'DictComp', 'comprehension'
+    'DictComp', 'comprehension', 'TypeAlias'
 ]
 
 TaskletType = Union[ast.FunctionDef, ast.With, ast.For]
@@ -4712,6 +4712,9 @@ def visit_Dict(self, node: ast.Dict):
     def visit_Lambda(self, node: ast.Lambda):
         # Return a string representation of the function
         return astutils.unparse(node)
+
+    def visit_TypeAlias(self, node: ast.TypeAlias):
+        raise NotImplementedError('Type aliases are not supported in DaCe')
 
     ############################################################
 

tests/python_frontend/type_statement_test.py

@@ -0,0 +1,19 @@
+# Copyright 2019-2023 ETH Zurich and the DaCe authors. All rights reserved.
+import dace
+import pytest
+
+
+def test_type_statement():
+
+    @dace.program
+    def type_statement():
+        type Scalar[T] = T
+        A: Scalar[dace.float32] = 0
+        return A
+
+    with pytest.raises(dace.frontend.python.common.DaceSyntaxError):
+        type_statement()
+
+
+if __name__ == '__main__':
+    test_type_statement()