sscanf

[Henrik Grubbstr�m (Lysator) @ Pike (-) developers forum]

The problem is probably due to the optimizer rule for F_SSCANF in
treeopt.in:

// sscanf(s[A..], "xxxx", ...)
//
//   =>
//
// (sscanf(s, "%*" + A + "s" + "xxxx", ...) || 1) - 1

Which seems to be sound as long as you don't use %n...