Fix crash on command substitution containing a sourced file#3487
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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Fixes #3479.
With
--external-sources, a command substitution whose last pipeline element resolves to a sourced file (e.g.x=$(source lib.sh)) makescheckExpansionWithRedirectioncall its localcheckCmdwith aT_SourceCommandrather than aT_Redirecting, and the single-clausecheckCmdthen aborts with "Non-exhaustive patterns in function checkCmd". This adds the missing catch-all so non-redirecting commands are simply ignored.