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| ANSI Common Lisp 23 Reader 23.2 Dictionary of Reader
23.2.11 set-syntax-from-char | Function
  Syntax: set-syntax-from-char to-char from-char `&optional` to-readtable from-readtable t Arguments and Values: to-char - a character. from-char - a character. to-readtable - a readtable. The default is the current readtable. from-readtable - a readtable designator. The default is the standard readtable. Description: set-syntax-from-char makes the syntax of to-char in to-readtable be the same as the syntax of from-char in from-readtable. set-syntax-from-char copies the syntax types of from-char. If from-char is a macro character, its reader macro function is copied also. If the character is a dispatching macro character, its entire dispatch table of reader macro functions is copied. The constituent traits of from-char are not copied. A macro definition from a character such as `"` can be copied to another character; the standard definition for `"` looks for another character that is the same as the character that invoked it. The definition of `(` can not be meaningfully copied to `{`, on the other hand. The result is that lists are of the form `{a b c)`, not `{a b c}`, because the definition always looks for a closing parenthesis, not a closing brace. Examples:
       (set-syntax-from-char #\7 #\;)   T
       123579  1235
Side Effects: The to-readtable is modified. Affected By: The existing values in the from-readtable. See Also: set-macro-character, make-dispatch-macro-character, Section 2.1.4 Character Syntax Types Notes: The constituent traits of a character are "hard wired" into the parser for extended tokens. For example, if the definition of `S` is copied to `*`, then `*` will become a constituent that is alphabetic2 but that cannot be used as a short float exponent marker. For further information, see Section 2.1.4.2 Constituent Traits. Allegro CL Implementation Details: None.

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