Sharpsign Equal-Sign (ANSI and GNU Common Lisp Document)

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#### 2.4.8.16 Sharpsign Equal-Sign

`#n=`

`#n=object` reads as whatever object has object as its printed representation. However, that object is labeled by n, a required unsigned decimal integer, for possible reference by the syntax `#n#`. The scope of the label is the expression being read by the outermost call to read; within this expression, the same label may not appear twice.