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Enable Bash's
inherit_errexit
(#1655)
By default Bash subshells (including command substitutions) do not inherit exit on error from the caller. This can cause surprises when functions are called from within command substitutions whose error handling is relying upon exit on error. For example, this cause error handling not to work as expected in the upcoming Python version handling reimplementation. However, as of Bash 4.4 this can be changed by enabling `inherit_errexit`. (The oldest Bash on our supported stacks is 5.0.) See: https://www.shellcheck.net/wiki/SC2311 https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html GUS-W-16899232.
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