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\DOC atleast
\TYPE {atleast : int -> ('a -> 'b * 'a) -> 'a -> 'b list * 'a}
\SYNOPSIS
Parses at least a given number of successive items using given parser.
\DESCRIBE
If {p} is a parser and {n} an integer, {atleast n p} is a new parser
that attempts to parse at least {n} successive items using parser {p} and fails
otherwise. Unless {n} is positive, this is equivalent to {many p}.
\FAILURE
The call to {atleast n p} itself never fails.
\COMMENTS
This is one of a suite of combinators for manipulating ``parsers''. A parser is
simply a function whose OCaml type is some instance of
{:('a)list -> 'b * ('a)list}. The function should take a list of objects of
type {:'a} (e.g. characters or tokens), parse as much of it as possible from
left to right, and return a pair consisting of the object derived from parsing
(e.g. a term or a special syntax tree) and the list of elements that were not
processed.
\SEEALSO
++, |||, >>, a, atleast, elistof, finished, fix, leftbin, listof, many, nothing,
possibly, rightbin, some.
\ENDDOC
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