CLHS: Section 2.4.8.9

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## 2.4.8.9 Sharpsign X

`#X`rational reads rational in hexadecimal (radix 16). The digits above `9` are the letters `A` through `F` (the lowercase letters `a` through `f` are also acceptable). For example,

     #xF00 ==  3840
     #x105 ==  261 ;10516

The consequences are undefined if the token immediately following the `#X` does not have the syntax of a hexadecimal (i.e., radix 16) rational.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- SHARP-O-FOOBAR:CONSEQUENCES-UNDEFINED

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