The documentation for '_enum" says this: 3.8 Enumerations and Masks
Although the constructors below are describes as procedures, they are implemented as syntax, so that error messages can report a type name where the syntactic context implies one. (_enum symbols [basetype]) → ctype? symbols : list? basetype : ctype? = _ufixint Takes a list of symbols and generates an enumeration type. The enumeration maps between a symbol in the given symbols list and corresponding integers, counting from0. The list symbols can also set the values of symbols by putting '= and an exact integer after the symbol. For example, the list '(x y = 10 z) maps 'x to 0, 'y to 10, and 'z to11. The basetype argument specifies the base type to use. This says nothing about what happens when using racket->C on a symbol that's not mentioned by the enumeration, or what happens when using C->racket on a number that's not mentioned in the enumeration. Based on my tests, it appears that the conversion signals an error in the racket->C direction, but simply returns #f in the C->racket direction. Should I document the current behavior, or would it make more sense to change it to signal an error rather than returning #f? John
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