CLHS: Section 2.4.8.15

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## 2.4.8.15 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.

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