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1.3.3 Printing Notation

Many of the examples in this manual print text when they are evaluated. In this manual the printed text resulting from an example is indicated by ‘-|’. The value that is returned by evaluating the expression is displayed with ‘⇒’ (1 in the next example) and follows on a separate line. 

printf ("foo %s\n", "bar")
     -| foo bar
     ⇒ 1