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SIGNATURE StringFold
$Date: 1998/06/16 15:59:59 $ ($Revision: 1.1.1.1 $)
-- folding of strings
IMPORT String ONLY string
Char ONLY char
FUN / \ : (char ** char -> char) ** string -> char
-- folding of strings
-- informally
-- + / <c0, c1, ..., en) == c0 + (c1 + ( ... + cn) ... )
-- + \ <c0, c1, ..., en) == (... (c0 + c1) + ... ) + cn
-- undefined for empty strings
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