Improve unvisited member warning format #36509
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This was referenced Jan 5, 2020
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Summary
SUMMARY: Build "Improve unvisited member warning format"
Purpose of change
Currently the unvisited member warning prints the whole JSON object, leading to over-long warning message if the JSON object is large. This PR makes it print only the nearby lines, by calling
throw_errorand catch the exception and print the message, like what is done intranslations.cpp.Testing
Ran the unit test and observed the imporved format of unvisited member warning messages.