go/analysis/cmd/vet: add errorsas analyzer

Change-Id: I4900b62cb460c8fab2fca6302b472bb531e46eb7
Reviewed-on: https://go-review.googlesource.com/c/tools/+/169457
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/go/analysis/cmd/vet/vet.go b/go/analysis/cmd/vet/vet.go
index c149315..4ad2ca6 100644
--- a/go/analysis/cmd/vet/vet.go
+++ b/go/analysis/cmd/vet/vet.go
@@ -26,6 +26,7 @@
 	"golang.org/x/tools/go/analysis/passes/cgocall"
 	"golang.org/x/tools/go/analysis/passes/composite"
 	"golang.org/x/tools/go/analysis/passes/copylock"
+	"golang.org/x/tools/go/analysis/passes/errorsas"
 	"golang.org/x/tools/go/analysis/passes/httpresponse"
 	"golang.org/x/tools/go/analysis/passes/loopclosure"
 	"golang.org/x/tools/go/analysis/passes/lostcancel"
@@ -58,6 +59,7 @@
 		cgocall.Analyzer,
 		composite.Analyzer,
 		copylock.Analyzer,
+		errorsas.Analyzer,
 		httpresponse.Analyzer,
 		loopclosure.Analyzer,
 		lostcancel.Analyzer,