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Stuart Cook
81378c8258
Don't make a def id for `impl_trait_in_bindings`
The def collector is awkward, so for now just wrap let statements in a new `ImplTraitContext::InBinding` which tells `visit_ty` not to make a def id for the type. This will not generalize to other ITIB cases, like if we allow them in turbofishes (e.g. `foo::<impl Fn()>(|| {})`).
Fixes #134307
r? oli-obk