add docstring
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@ -20,6 +20,7 @@ pub fn get_guaranteed_cwd(engine_state: &EngineState, stack: &Stack) -> PathBuf
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type MakeRangeError = fn(&str, Span) -> ShellError;
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/// Returns a inclusively pair of boundary in given `range`.
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pub fn process_range(range: &Range) -> Result<(isize, isize), MakeRangeError> {
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match range {
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Range::IntRange(range) => {
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