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In the AST the "then" block is represented as a `Block`. In HIR the "then" block is represented as an `Expr` that happens to always be. `ExprKind::Block`. By deconstructing the `ExprKind::Block` to extract the block within, things print properly. For `issue-82392.rs`, note that we no longer print a type after the "then" block. This is good, it now matches how we don't print a type for the "else" block. (Well, we do print a type after the "else" block, but it's for the whole if/else.) Also tighten up some of the pattern matching -- these block expressions within if/else will never have labels.