Some applications (for example, diagnostics shown to a user in an
editor) may want to distinguish between errors generated by
the driver, parser, and type-checker. The Error struct did not have any
mechanism for doing this, so add an ErrorKind field and set it in
appendError.
Change-Id: If347163225d1e3a567e98610e9ba8a0930e4659c
Reviewed-on: https://go-review.googlesource.com/139317
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
9599141856