Add hint to read source code for help
In trying to give error diagnostics with template definitions of invalid types, the user encounters some pretty confusing error messages at first. There is no way to get the compiler to give exactly the diagnostics we want in a nice readable error message, so we are putting some verbose instructions as comments in the code. However, a user might not know to look at the source code since the error happens deep in an unfamiliar (and complicated) class. Thus, add (yet another) error at the front that gives a (hopefully) clear indication to look at the source code for help in understanding the errors.
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