diff --git a/exhaustive.go b/exhaustive.go
index 8632fe1..f918fef 100644
--- a/exhaustive.go
+++ b/exhaustive.go
@@ -194,7 +194,7 @@ To ignore specific constants in exhaustiveness checks, use the
 -ignore-enum-members flag. Similarly, to ignore specific types, use the
 -ignore-enum-types flag. For example:
 
-	exhaustive -ignore-enum-types '^time\.Duration$|^example.org/measure\.Unit$'
+	exhaustive -ignore-enum-types '^time\.Duration$|^example\.org/measure\.Unit$'
 
 [language spec]: https://golang.org/ref/spec
 */
diff --git a/exhaustive_go118_test.go b/exhaustive_go118_test.go
deleted file mode 100644
index b9e2312..0000000
--- a/exhaustive_go118_test.go
+++ /dev/null
@@ -1,12 +0,0 @@
-//go:build go1.18
-// +build go1.18
-
-package exhaustive
-
-import (
-	"testing"
-)
-
-func TestExhaustiveGo118(t *testing.T) {
-	runTest(t, "typeparam/...")
-}
diff --git a/exhaustive_test.go b/exhaustive_test.go
index c2644b7..484713a 100644
--- a/exhaustive_test.go
+++ b/exhaustive_test.go
@@ -7,26 +7,26 @@ import (
 	"golang.org/x/tools/go/analysis/analysistest"
 )
 
-func runTest(t *testing.T, pattern string, setup ...func()) {
-	t.Helper()
-	t.Run(pattern, func(t *testing.T) {
-		resetFlags()
-		// default to checking switch and map for test.
-		fCheck = stringsFlag{
-			[]string{
-				string(elementSwitch),
-				string(elementMap),
-			},
-			nil,
-		}
-		for _, f := range setup {
-			f()
-		}
-		analysistest.Run(t, analysistest.TestData(), Analyzer, pattern)
-	})
-}
-
 func TestExhaustive(t *testing.T) {
+	runTest := func(t *testing.T, pattern string, setup ...func()) {
+		t.Helper()
+		t.Run(pattern, func(t *testing.T) {
+			resetFlags()
+			// default to checking switch and map for test.
+			fCheck = stringsFlag{
+				[]string{
+					string(elementSwitch),
+					string(elementMap),
+				},
+				nil,
+			}
+			for _, f := range setup {
+				f()
+			}
+			analysistest.Run(t, analysistest.TestData(), Analyzer, pattern)
+		})
+	}
+
 	if !testing.Short() {
 		// Analysis of code that uses complex packages, such as package os and
 		// package reflect, should not fail.
@@ -76,6 +76,7 @@ func TestExhaustive(t *testing.T) {
 	runTest(t, "duplicate-enum-value/...")
 
 	runTest(t, "typealias/...")
+	runTest(t, "typeparam/...")
 
 	// mixture of general tests.
 	runTest(t, "general/...")
diff --git a/testdata/src/complexpkg/complexpkg.go b/testdata/src/complexpkg/complexpkg.go
index f355c16..b700ca5 100644
--- a/testdata/src/complexpkg/complexpkg.go
+++ b/testdata/src/complexpkg/complexpkg.go
@@ -14,13 +14,14 @@ import (
 func useComplexPackages() {
 	// see issue 25: https://github.com/nishanths/exhaustive/issues/25
 	var (
-		_ http.Server
+		_ elliptic.Curve
 		_ tls.Conn
-		_ reflect.ChanDir
 		_ json.Encoder
-		_ elliptic.Curve
-		_ time.Ticker
+		_ fmt.Formatter
+		_ http.Server
 		_ os.File
+		_ reflect.ChanDir
+		_ time.Ticker
 	)
-	fmt.Println(os.LookupEnv(""))
+	fmt.Println(os.Getgid())
 }
diff --git a/testdata/src/typeparam/build.go b/testdata/src/typeparam/build.go
new file mode 100644
index 0000000..8856492
--- /dev/null
+++ b/testdata/src/typeparam/build.go
@@ -0,0 +1,4 @@
+package typeparam
+
+// This file exists so that the package (which, otherwise, consists only of
+// go1.18 files) can build with all go versions.