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symchar: add alarm and backspace chars

--- a/read.c

+++ b/read.c

@@ -20,7 +20,7 @@

 // an ordinary symbol character unless it's the first character.

 static inline int symchar(char c)

 {

-    static char *special = "()[]'\";`,\\| \f\n\r\t\v";

+    static char *special = "()[]'\";`,\\| \a\b\f\n\r\t\v";

     return !strchr(special, c);

 }