[plt-scheme] "implicitly mutable"?

From: Raoul Duke (raould at gmail.com)
Date: Mon Oct 20 02:27:52 EDT 2008

"#:auto-value auto-expr Specifies a value to be used for all automatic
fields in the structure type, where an automatic field is indicated by
the #:auto field option. The constructor procedure does not accept
arguments for automatic fields, and they are implicitly mutable."

but, apparently there's no mutating set procedure created unless i
also mark it as #:mutable, so i don't grok what it means for them to
be implicitly mutable, if i can't mutate them.


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