Fix is_char_boundary documentation #72773
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Rollup of 13 pull requests Successful merges: - rust-lang#72543 (Account for missing lifetime in opaque and trait object return types) - rust-lang#72625 (Improve inline asm error diagnostics) - rust-lang#72637 (expand `env!` with def-site context) - rust-lang#72650 (Sort sidebar elements) - rust-lang#72657 (Allow types (with lifetimes/generics) in impl_lint_pass) - rust-lang#72666 (Add -Z profile-emit=<path> for Gcov gcda output.) - rust-lang#72668 (Fix missing parentheses Fn notation error) - rust-lang#72669 (rustc_session: Cleanup session creation) - rust-lang#72728 (Make bootstrap aware of relative libdir in stage0 compiler) - rust-lang#72757 (rustc_lexer: Optimize shebang detection slightly) - rust-lang#72772 (miri validation: clarify valid values of 'char') - rust-lang#72773 (Fix is_char_boundary documentation) - rust-lang#72777 (rustdoc: remove calls to `local_def_id_from_node_id`) Failed merges: r? @ghost
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Given the "start and/or end" wording in the original, the way I understood it was that the
str::is_char_boundarymethod would also returntruefor the last byte in a UTF-8 code point sequence. (Which would have meant that for a string consisting of nothing but 1 and 2 byte UTF-8 code point sequences, it would return nothing buttrue.)In practice the method returns
trueonly for the starting byte of each sequence and the end of the string: PlaygroundI was also somewhat tempted to remove the The start and end of the string are considered to be boundaries, since that's implied by the first sentence, but I decided to avoid bikeshedding over it and left it as it was since it's not wrong in relation to how the method behaves.