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2ad6272649
Port `#[track_caller]` to the new attribute system r? ``@oli-obk`` depends on https://github.com/rust-lang/rust/pull/142493 Closes rust-lang/rust#142783 (didn't add a test for this, this situation should simply never come up again, the code was simply wrong. lmk if I should add it, but it won't test something very useful)
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.