Function FormatIssues

compiler/optional_test.cc:59–67

class OptionalTest : public testing::TestWithParam<TestCase> {};

std::string FormatIssues(const ValidationResult& result) {
  const Source* source = result.GetSource();
  return absl::StrJoin(
      result.GetIssues(), "\n",
      [=](std::string* out, const TypeCheckIssue& issue) {
        absl::StrAppend(
            out, (source) ? issue.ToDisplayString(*source) : issue.message());
      });
}

TEST_P(OptionalTest, OptionalsEnabled) {
  const TestCase& test_case = GetParam();