Tim Hockin d187d7effa Rewrite typecheck against x/tools/go/packages ...

This runs much faster than before.  This change removes all of the
async status output because all of the compute time is spent inside
go/packages, with no opportunity to update the status.

Adds testdata code to prove it fails when expected.

2020-06-26 11:12:06 -07:00

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