exec: Don't exit on exec failure if interactive #87
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This commit implements the new POSIX.1-2024 requirement. Previously, failure in the exec built-in on an interactive shell caused the shell to exit only if the POSIXly-correct mode was off. The mode no longer affects the shell behavior. The test file "exec-p.tst" is synced with: https://github.com/magicant/yash-rs/blob/218275d85908442e4aa4c06dbe41d93f6cf62a37/yash-cli/tests/scripted_test/exec-p.sh
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This commit implements the new POSIX.1-2024 requirement.
Previously, failure in the exec built-in on an interactive shell caused the shell to exit only if the POSIXly-correct mode was off. The mode no longer affects the shell behavior.
This PR is the yash counterpart to magicant/yash-rs#424.