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IAT: Reinstate early bailout Apparently, some people are already using IATs in their projects and get blocked by https://github.com/rust-lang/rust/issues/142006#issuecomment-3508543649 (cc dupes https://github.com/rust-lang/rust/issues/143952 & https://github.com/rust-lang/rust/issues/148535). Since the (temporary) fix is so trivial, let's just do it. Addresses https://github.com/rust-lang/rust/issues/142006#issuecomment-3508543649. cc ```@luissantosHCIT``` (https://github.com/rust-lang/rust/issues/148535). r? ```@BoxyUwU```
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.