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SC2127: POSIX.1-2024 now allows `;&` in `case` (fallthrough) #3166

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e-kwsm opened this issue Mar 23, 2025 · 0 comments

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e-kwsm commented Mar 23, 2025

https://pubs.opengroup.org/onlinepubs/9799919799/xrat/V4_xcu_chap01.html#tag_23_02_09_19

Instead, the standard now requires a feature first added in KornShell that using ";&" instead of ";;" as a terminator causes the exact opposite behavior—the flow of control continues with the next compound-list.

Some implementations of the shell also allow ";;&" as a terminator which falls through to the next matching pattern (regardless of the choice of terminator in any intermediate non-matching clauses), in contrast to ";&" falling through to the next clause (regardless of the pattern guarding that clause). This is an allowed extension, but is not required by the standard at this time.

Note: dash b3e38adf6718801e7f06267b438c45caec9523bb does not support ;& yet.

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