>> I don't know what triggers it and google does not return any results.
>> Just curious, is it something I should be worried about?
>> I am using Racket v7.5 if it helps.

Searching google for "collapsible contract" should point to these
pages, at least:


In short, racket/contract has two flavors for some contracts: "normal"
and "collapsible". Those log messages appear when the library tries to
use "collapsible" but has to fall back.

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