Rollup merge of #156795 - P8L1:fix-generic-reborrow-expr-use-visitor, r=dingxiangfei2009 Handle generic reborrow in expression-use adjustment walking Fixes an ICE in expression-use adjustment walking where `Adjust::GenericReborrow` could reach a match arm that assumed generic reborrow was unreachable. `GenericReborrow` is already emitted by typeck and classified as rvalue-producing elsewhere in `expr_use_visitor.rs`, so the adjustment walker must handle it explicitly instead of panicking. This PR models `GenericReborrow` as a borrow-like use of the source expression: - `Mutability::Mut` is treated like an exclusive/mutable reborrow use. - `Mutability::Not` is treated like a shared/coerce-shared borrow-like use. - The source is not moved or treated as a mere copy. cc @aapoalas @rustbot label F-reborrow Fixes https://github.com/rust-lang/rust/issues/156339 Tracking: https://github.com/rust-lang/rust/issues/145612
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