There are good reasons why Rust cannot feasibly detect and replace all blanket implementations with specialized implementations during instantiation. This is because a function like get_first_value can be called by other generic functions, such as the print_first_value function that is defined here. In this case, the fact that get_first_value uses Hash becomes totally obscured, and it would not be obvious that print_first_value indirectly uses it by just looking at the generic trait bound.
async def on_pick(winner=""):
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民航运输方面，预估客运量为169万人次，环比下降11.8%，较去年同期微降0.4%。（央视新闻）