Don't open temp file if __input is absent #10
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This fixes a logic bug: due to the truthiness of the empty string,
the temp file is always created, and the shell always called with
a file redirect.
While this is unlikely to change the result of a program, it
could, and the implication of checking for args.input is that this
was unintended behavior.
On branch fix-input-logic
modified: sh.lua