ANSI Common Lisp   2 Syntax   2.4 Standard Macro Characters

2.4.9 Re-Reading Abbreviated Expressions

Note that the Lisp reader will generally signal an error of type reader-error when reading an expression₂ that has been abbreviated because of length or level limits (see *print-level*, *print-length*, and *print-lines*) due to restrictions on "..", "...", "#" followed by whitespace₁, and "#)".