Function extern_spec_T_From_legacy_Range_T_Range_T_from 

pub fn extern_spec_T_From_legacy_Range_T_Range_T_from<T>(
    value: Range<T>,
) -> Range<T>

extern spec for Range<T>::from

This is not a real function: its only use is for documentation.

ensures

result == Range { start: value.start, end: value.end }