add boolean=? to r6rs

svn: r9947

collects/rnrs/base-6.ss

@@ -75,7 +75,7 @@
              [r6rs:string->number string->number])
 
  ;; 11.8
- not boolean?
+ not boolean? boolean=?
 
  ;; 11.9
  (rename-out [r5rs:pair? pair?]

collects/tests/r6rs/base.ss

@@ -951,6 +951,11 @@
     (test (boolean? 0)           #f)
     (test (boolean? '())         #f)
 
+    (test (boolean=? #f #f) #f)
+    (test (boolean=? #t #t) #t)
+    (test (boolean=? #t #f) #f)
+    (test (boolean=? #f #t) #f)
+
     ;; 11.9
     (test (pair? '(a . b))         #t)
     (test (pair? '(a b c))         #t)