1 files changed, 10 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index 9f14466816..df19699c0d 100644
--- a/parse.y
+++ b/parse.y
@@ -6222,6 +6222,16 @@ rb_intern(name)
     }
     if (*m) id = ID_JUNK;
   new_id:
+    if (last_id >= SYM2ID(~(VALUE)0) >> ID_SCOPE_SHIFT) {
+	if (last > 20) {
+	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.20s...)",
+		     name);
+	}
+	else {
+	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.*s)",
+		     last, name);
+	}
+    }
     id |= ++last_id << ID_SCOPE_SHIFT;
   id_regist:
     name = strdup(name);