Clarify the limitation of ? in main and tests #219
Merged
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I was trying to figure out why my error messages were not printing how I wanted them to (using Display). This page in the edition book is one of the first links that pops up when I googled it, but it wasn't till I saw this post on the rust forum that I realized there was no way to do this "automatically", so I thought it might be helpful for others to clarify in these docs as well.