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Behaviors considered undefined by the ISO C Standard

The following are considered undefined behavior by the ISO C Standard:

  • In character and string escapes, if the character following the \ has no special meaning, the value of the escape is the character itself. For example, a warning is generated if you use \s because it is the same as s.

  • A struct that has no named fields but at least one unnamed field is accepted by default, but generates an error in strict 1990 ISO Standard C.