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Add check for duplicate parameter names.
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@ -71,6 +71,12 @@ class LocalExtractor(algorithm.Visitor):
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self.typing_env[name] = types.TVar()
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def visit_arg(self, node):
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if node.arg in self.params:
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diag = diagnostic.Diagnostic("error",
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"duplicate parameter '{name}'", {"name": node.arg},
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node.loc)
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self.engine.process(diag)
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return
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self._assignable(node.arg)
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self.params.add(node.arg)
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@ -20,6 +20,10 @@ def d(x):
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# CHECK-L: ${LINE:+1}: error: name 'x' cannot be a parameter and global simultaneously
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global x
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def d(x):
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def e(x):
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# CHECK-L: ${LINE:+1}: error: name 'x' cannot be a parameter and nonlocal simultaneously
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nonlocal x
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# CHECK-L: ${LINE:+1}: error: duplicate parameter 'x'
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def f(x, x):
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pass
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