module Substring_intf: Substring_intf
val __pa_ounit_275876e34cf609db118f3d84b799a790 : string
module type S =sig
..end
create ?pos ?len base
creates a substring of the base sequence of
* length len
starting at position pos
, i.e.
*
* base.pos
, base.pos + 1
, ... base.pos + len - 1
*
* It is required that:
* 0 <= pos
* 0 <= len
* pos + len <= length base
*
* It does not copy the characters.