The syntax for adding type hints to an argument is: foo(x: T), replace T with the real type.
Complete code following the instructions, so that lines followed by
# expect-type-error (if any)
fail type check, while others can pass.
Hit the "▶️ Run" button to see result.
The syntax for adding type hints to an argument is: foo(x: T), replace T with the real type.
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