5.1. Generalized Reference
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## 5.1. Generalized Reference [sec_5-1]

`&KEY` markers in `DEFSETF` lambda lists are supported, but the corresponding keywords must appear literally in the program text.

An attempt to modify read-only data `SIGNAL`s an `ERROR`. Program text and quoted constants loaded from files are considered read-only data. This check is only performed for strings, not for conses, other kinds of arrays, and user-defined data types.

See also Section 31.11.2, “Macros `EXT:LETF` & `EXT:LETF*`”.

| These notes document CLISP version 2.45 | Last modified: 2008-05-14

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