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-rw-r--r--src/eval.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/eval.c b/src/eval.c
index 959adea6467..9daae92e55a 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -831,6 +831,7 @@ usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
Lisp_Object sym, tem;
sym = XCAR (args);
+ CHECK_SYMBOL (sym);
Lisp_Object docstring = Qnil;
if (!NILP (XCDR (XCDR (args))))
{