When I reload my init file I get an error (or warning) saying
unescaped character literals `?(', `?)', `?[', `?]' detected!
What does this error (warning) mean and how can one fix it?
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Section 22.214.171.124 Basic Char Syntax of the Elisp manual says:
The usual read syntax for alphanumeric characters is a question mark followed by the character; thus, ‘?A’ for the character ‘A’, ‘?B’ for the character ‘B’, and ‘?a’ for the character ‘a’. For example: ?Q ⇒ 81 ?q ⇒ 113 You can use the same syntax for punctuation characters. However, if the punctuation character has a special syntactic meaning in Lisp, you must quote it with a ‘\’. For example, ‘?\(’ is the way to write the open-paren character. Likewise, if the character is ‘\’, you must use a second ‘\’ to quote it: ‘?\\’.
Your init file contains
?( but Emacs prefers to see
?\(. The same goes for the other three characters mentioned in the warning.
You can load the Elisp manual inside Emacs with