Fix string-to-syntax signature in comp-known-type-specifiers

* lisp/emacs-lisp/comp.el (comp-known-type-specifiers):
`string-to-syntax` can return nil.

diff --git a/lisp/emacs-lisp/comp.el b/lisp/emacs-lisp/comp.el
index 869781bea15270fb8217aba31646604bad670fae..304ea8cc6c10dd534cd5459a49eb3e682e7fde5c 100644 (file)
--- a/lisp/emacs-lisp/comp.el
+++ b/lisp/emacs-lisp/comp.el
@@ -520,7 +520,7 @@ Useful to hook into pass checkers.")
     (string-to-char (function (string) fixnum))
     (string-to-multibyte (function (string) string))
     (string-to-number (function (string &optional integer) number))
-    (string-to-syntax (function (string) cons))
+    (string-to-syntax (function (string) (or cons null)))
     (string< (function ((or string symbol) (or string symbol)) boolean))
     (string= (function ((or string symbol) (or string symbol)) boolean))
     (stringp (function (t) boolean))