Exit gracefully on unreadable input instead of panicking#9
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Replace the panics in read_input with a plain stderr message (same text as before) and a non-zero exit, so a bad file argument no longer surfaces as a Rust panic with a backtrace note.
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Replace the panics in read_input with a plain stderr message (same text as before) and a non-zero exit, so a bad file argument no longer surfaces as a Rust panic with a backtrace note.