[plt-scheme] Testing Readability

Use read-from-string from mzlib/string.

Chongkai

Henk Boom wrote:
> I've defined 'read-from-string' as:
>
> (define (read-from-string s)
>   (read (open-input-string s)))
>
> Is it possible to test the readability of a string to define a
> 'readable-string?' function without just catching all exceptions from
> read?
>
>     Henk
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