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[`impl_trait_in_params`]: avoid ICE when function with `impl Trait` type has no parameters Fixes #11803 If I'm reading the old code correctly, it was taking the span of the first parameter (without checking that it exists, which caused the ICE) and uses that to figure out where the generic parameter to insert should go (cc `@blyxyas` you wrote the lint, is that correct?). This seemed equivalent to just `generics.span`, which doesn't require calculating the spans like that and simplifies it a fair bit changelog: don't ICE when function has no parameters but generics have an `impl Trait` type |
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