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a5945b5d8d
Count stashed errors again Stashed diagnostics are such a pain. Their "might be emitted, might not" semantics messes with lots of things. #120828 and #121206 made some big changes to how they work, improving some things, but still leaving some problems, as seen by the issues caused by #121206. This PR aims to fix all of them by restricting them in a way that eliminates the "might be emitted, might not" semantics while still allowing 98% of their benefit. Details in the individual commit logs. r? `@oli-obk`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.