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e7281d08de
diagnostics: use rustc_on_unimplemented to recommend `[].iter()` To make this work, the `#[rustc_on_unimplemented]` data needs to be used to report method resolution errors, which is most of what this commit does. Fixes #94581
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.