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fixes from hoosierEE

Jeremy Siek 4 年之前
父節點
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4b189616ba
共有 1 個文件被更改,包括 1 次插入1 次删除
  1. 1 1
      book.tex

+ 1 - 1
book.tex

@@ -8638,7 +8638,7 @@ Note that in both \key{inject} and
 which simplifies the implementation and corresponds with what is
 needed for compiling untyped Racket. The type predicates,
 $(\key{boolean?}\,e)$ etc., expect a tagged value and return \key{\#t}
-if the tag corresponds to the predicate, and return \key{\#t}
+if the tag corresponds to the predicate, and return \key{\#f}
 otherwise.
 %
 Selections from the type checker for $R_6$ are shown in