[ast-users] [ksh93] RFE: Don't reset $? to 0 if an empty command is inputted in interactive shell.

[Clark J. Wang]

For example, in the interactive ksh:

$ false
$    <== Input some white spaces and press <ENTER>
$ echo $?
0    <== Here I want it still to be 1.
$

Bash and zsh both preserves the $? value after empty commands.

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