test: Run go vet with -source flag in newer releases

This should hopefully eliminate some false positives.
https://github.com/golang/go/issues/20514

test/test-govet.sh

@@ -14,6 +14,8 @@ function run-test()
 ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"	# dir!
 cd "${ROOT}"
 
+GO_VERSION=($(go version))
+
 function simplify-gocase() {
 	if grep 'case _ = <-' "$1"; then
 		return 1	# 'case _ = <- can be simplified to: case <-'
@@ -30,7 +32,12 @@ function token-coloncheck() {
 }
 
 for file in `find . -maxdepth 3 -type f -name '*.go' -not -path './old/*' -not -path './tmp/*'`; do
+	if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.2|go1.3|go1.4|go1.5|go1.6|go1.7|go1.8') ]]; then
+		# workaround go vet issues by adding the new -source flag (go1.9+)
+		run-test go vet -source "$file" || fail_test "go vet -source did not pass"
+	else
 		run-test go vet "$file" || fail_test "go vet did not pass"	# since it doesn't output an ok message on pass
+	fi
 	run-test grep 'log.' "$file" | grep '\\n"' && fail_test 'no newline needed in log.Printf()'	# no \n needed in log.Printf()
 	run-test simplify-gocase "$file"
 	run-test token-coloncheck "$file"