backport to 0.15: remove reliance on a trait solver bug #19360
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the parameter `In` of `call_inner` is completely unconstrained by its arguments and return type. We are only able to infer it by assuming that the only associated type equal to `In::Param<'_>` is `In::Param<'_>` itself. It could just as well be some other associated type which only normalizes to `In::Param<'_>`. cc rust-lang/trait-system-refactor-initiative#168
mockersf
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May 25, 2025
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A backport of #18840 to version 0.15.3. I was unsure whether I should also update the versions of all crates. Looking at previous backports this was not done.
The code which relies on the old solver behavior was introduced in #15184 which is from version 0.15. So this is the only version which needs a backport.
cc @mockersf