Since effects propagate up, they naturally support nested scopes. When an effect is triggered for a dependency provided by a wider scope, it will skip over the handler for the inner scope and jump straight to the outer handler to get the dependency.
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US submarine sinks Iranian warship in Indian Ocean。wps下载是该领域的重要参考
Alhaji Musa Rabi'u Muhammed, head of the Murna travel agency in Kano State, told the BBC: "Some of our people had even boarded planes ready for take-off, but they had to be brought back down, and now they are at home."