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\DOC print_to_string
\TYPE {print_to_string : (formatter -> 'a -> 'b) -> 'a -> string}
\SYNOPSIS
Modifies a formatting printing function to return its output as a string.
\DESCRIBE
If {p} is a printing function whose first argument is a formatter (a standard
OCaml datatype indicating an output for printing functions), {print_to_string
P} gives a function that invokes it and collects and returns its output as a
string.
\FAILURE
Fails only if the core printing function fails.
\EXAMPLE
The standard function {string_of_term} is defined as:
{
# let string_of_term = print_to_string pp_print_term;;
}
\USES
Converting a general printing function to a `convert to string' function, as in
the example above.
\SEEALSO
pp_print_term, pp_print_thm, pp_print_type.
\ENDDOC
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