fix: preserve mixed-fence code blocks in doc rendering#22350
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`format_docs_` was toggling `in_code_block` whenever any RUSTDOC_FENCES prefix appeared, so a `~~~` line inside a ```-opened block would close the block prematurely (and a ``` line inside a ~~~-opened block would do the same). Track which fence opened the current block in `current_fence: Option<&'static str>` and only close on the matching fence. Closes rust-lang#13815. Signed-off-by: Onyeka Obi <softwareengineerasaservant@isurvivable.cv>
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Resurrects the fix that #13850 attempted in 2023 before being closed for inactivity.
format_docs_was treating ``` and ~~~ as interchangeable fences, so a literal~~~line inside a ```-opened block closed the block early (and the mirror case for ```-inside- ~~~). Tracks the opening fence and closes only on a match.Closes #13815.