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958417fba1
Fix scoping for let chains in match guards If let guards were previously represented as a different type of guard in HIR and THIR. This meant that let chains in match guards were not handled correctly because they were treated exactly like normal guards. - Remove `hir::Guard` and `thir::Guard`. - Make the scoping different between normal guards and if let guards also check for let chains. closes #118593
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.