Thanks to you and Robby Findler for your quick replies!

March 14, 2020 4:17 PM, "Ben Greenman" <benjaminlgreen...@gmail.com> wrote:

>>> 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:
> 
> https://docs.racket-lang.org/reference/collapsible.html
> https://users.cs.northwestern.edu/~dmf082/papers/collapsible.pdf
> 
> 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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