[plt-scheme] Are booleans s-expressions?

From: Stephen Chang (stchang at ccs.neu.edu)
Date: Fri Mar 19 00:31:28 EDT 2010

I'm using PLT scheme 4.2.3 on windows xp. I'm using the intermediate
language with lambda and the 2htdp/universe teachpack.

The documentation says that booleans are s-expressions but the sexp?
function doesnt seem to recognize that. Am I using it wrong?

> (sexp? true)
> (sexp? false)


S-expression An S-expression is roughly a nested list of basic data;
to be precise, an S-expression is one of:

    *     a string,
    *     a symbol,
    *     a number,
    *     a boolean,
    *     a char, or
    *     a list of S-expressions.

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