Propagating syntax for good errors

[countvajhula]

This is WIP from today's meeting, and is intended to be used together with an upcoming utility in Syntax Spec to help implicate the appropriate user syntax when an error happens during compilation.

Summary of Changes

WIP from the meeting on Mar 29, following up on recent discussions around error reporting.

Public Domain Dedication

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[countvajhula]

@michaelballantyne @dzoep