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Currently, error messages that germane to GADT constructors
put the source span at only the first character in the constructor,
leading to insufficient caret diagnostics. This can be easily fixed
by using a source span that spans the entire constructor, instead of
just the first character.
Test Plan: make test TEST=T14719
Reviewers: alanz, bgamari, simonpj
Reviewed By: alanz, simonpj
Subscribers: simonpj, goldfire, rwbarton, thomie, carter
GHC Trac Issues: #14719
Differential Revision: https://phabricator.haskell.org/D4344
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