Auto merge of #153074 - jhpratt:rollup-6aKDmTD, r=jhpratt Rollup of 12 pull requests Successful merges: - rust-lang/rust#149169 (ptr::replace: make calls on ZST null ptr not UB) - rust-lang/rust#150562 (Fix doc link used in suggestion for pinning self) - rust-lang/rust#152418 (`BTreeMap::merge` optimized) - rust-lang/rust#152679 (rustc_expand: improve diagnostics for non-repeatable metavars) - rust-lang/rust#152952 (mGCA: improve ogca diagnostic message ) - rust-lang/rust#152977 (Fix relative path handling for --extern-html-root-url) - rust-lang/rust#153017 (Implement debuginfo for unsafe binder types) - rust-lang/rust#152868 (delete some very old trivial `Box` tests) - rust-lang/rust#152922 (rustc_public: Make fields that shouldn't be exposed visible only in `rustc_public`) - rust-lang/rust#153032 (Fix attribute parser and kind names.) - rust-lang/rust#153051 (Migration of `LintDiagnostic` - part 3) - rust-lang/rust#153060 (Give a better error when updating a submodule fails)
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