set-syntax-from-char to-char from-char {&optional to-readtable from-readtable} => t
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.
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.
(set-syntax-from-char #\7 #\;) => T 123579 => 1235
The to-readtable is modified.
The existing values in the from-readtable.
@xref{set-macro-character; get-macro-character} , section make-dispatch-macro-character [Function] , section Character Syntax Types
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 alphabetic_2 but that cannot be used as a short float exponent marker. For further information, see section Constituent Traits.
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