Discard remaining commands on shell errors if interactive#151
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This commit renames the E_SUSPEND exception to E_CANCEL. The E_CANCEL exception will be raised not only when a foreground job is suspended but also when a shell error occurs that would terminate the shell if it were not interactive. This change is made to make the exception name match its purpose.
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POSIX says:
Existing shells seem to abort the current command execution and prompt for a next command when they encounter such an error. This pull request makes yash follow this convention.