Rollup of 6 pull requests Successful merges: - rust-lang/rust#148234 (rustdoc: make mergeable crate info more usable) - rust-lang/rust#149201 (Add suggest alternatives for Out-of-range \x escapes) - rust-lang/rust#149208 ([rustdoc] Make more functions return `fmt::Result` and reduce number of `.unwrap()` calls) - rust-lang/rust#149252 (miri: use `tikv-jemalloc-sys` from sysroot) - rust-lang/rust#149255 (Use `let...else` consistently in user-facing diagnostics) - rust-lang/rust#149275 (Fix missing double-quote in `std::env::consts::OS` values) r? `@ghost` `@rustbot` modify labels: rollup