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\DOC file_of_string
\TYPE {file_of_string : string -> string -> unit}
\SYNOPSIS
Write out a string to a named file.
\DESCRIBE
Given a filename {fn} and a string {s}, the call {file_of_string fn s} attempts
to open the file {fn} for writing and writes the string {s} to it before
closing. If the file exists, it will be overwritten, and otherwise a new file
will be created.
\FAILURE
Fails if the file cannot be opened for writing.
\EXAMPLE
The call
{
# file_of_string "/tmp/hello" "Hello world\nGoodbye world";;
val it : unit = ()
}
will result in a file {/tmp/hello} containing the text:
{
Hello world
Goodbye world
\SEEALSO
string_of_file, strings_of_file.
\ENDDOC
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