Working on it. Trying things out but it'll be always a guess, because by the time we have the lifetimes we cannot tie those back to the exact part of the type.
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Wow. That's an awesomely helpful message. Do any other lifetime diagnostics give suggestions like that already? That seems useful in even a far simpler case, like: fn (a: &T, b: &T) -> &T {} where you need to annotate the correct lifetimes
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Ah, sorry, I meant in the case where having the same lifetime used to be okay, but now you need to annotate if the return lifetime is from a or b. That being said, even that diagnostic is better than I remember!
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This is new to 1.44, which just landed.
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