Hi Travis,

This is something I stumbled over recently as well. As others pointed out, 
declaring "type alias" also creates constructor for that type.
However this only works for records. So in your example
Foo "herp"
works, because Foo is *explicitly* defined as a record, but
Derp "herp"
doesn't. This is a bit confusing (Foo and Derp should be the same thing, 
right?), but it's just how aliases currently work.
You're certainly not the first person to hit this 
https://github.com/elm-lang/elm-compiler/issues/1019, probably it could be 
stated more directly in the guide

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