Ensure all test code is valid and compiles (#200)

The code has always been valid enough to build a proper syntax tree but
this will ensure that each folder actually builds and compiles without
any errors as well.

This is to ensure no diagnostics are missed due to invalid syntax.

Author: bombsimon

testdata/src/default_config/assign/assign.go

@@ -49,13 +49,17 @@ func assignAndCall() {
 	t1.Fn()
 	x := t1.Fn()
 	t1.Fn()
+
+	_, _ = t2, x
 }
 
 func closureInCall() {
 	buf := &bytes.Buffer{}
-	err := Fnc("buf", func() error {
+	err := FnC("buf", func() error {
 		return json.NewEncoder(buf).Encode("x")
 	})
+
+	_ = err
 }
 
 func assignAfterBlock() {
@@ -69,4 +73,6 @@ func assignAfterBlock() {
 func decl() {
 	var x string
 	y := "" // want `missing whitespace above this line \(invalid statement above assign\)`
+
+	_, _ = x, y
 }

testdata/src/default_config/assign/assign.go.golden

@@ -50,13 +50,17 @@ func assignAndCall() {
 	t1.Fn()
 	x := t1.Fn()
 	t1.Fn()
+
+	_, _ = t2, x
 }
 
 func closureInCall() {
 	buf := &bytes.Buffer{}
-	err := Fnc("buf", func() error {
+	err := FnC("buf", func() error {
 		return json.NewEncoder(buf).Encode("x")
 	})
+
+	_ = err
 }
 
 func assignAfterBlock() {
@@ -72,4 +76,7 @@ func decl() {
 	var x string
 
 	y := "" // want `missing whitespace above this line \(invalid statement above assign\)`
+
+	_, _ = x, y
 }
+

testdata/src/default_config/branch/branch.go

@@ -2,96 +2,97 @@ package testpkg
 
 import "fmt"
 
-func fn1() {
-	for range []int{} {
-		if true {
-			fmt.Println("")
-
-			continue
-		}
-
-		if true {
-			fmt.Println("")
-			break
-		}
-
-		if true {
-			fmt.Println("")
-			continue
-		}
-
-		if true {
-			fmt.Println("")
-			fallthrough
+func validCases() {
+START:
+	fmt.Println("start")
+
+	switch 1 {
+	case 1:
+		for range []int{} {
+			if true {
+				fmt.Println("")
+
+				continue
+			}
+
+			if true {
+				fmt.Println("")
+				break
+			}
+
+			if true {
+				fmt.Println("")
+				continue
+			}
+
+			if true {
+				fmt.Println("")
+				goto START
+			}
+
+			if false {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+
+				break
+			}
+
+			if false {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+
+				continue
+			}
+
+			if false {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+
+				goto START
+			}
 		}
 
-		if true {
-			fmt.Println("")
-			goto START
-		}
-
-		if false {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-
-			break
-		}
-
-		if false {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-
-			continue
-		}
-
-		if false {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-
-			fallthrough
-		}
-
-		if false {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-
-			goto START
-		}
+		fallthrough
+	case 2:
 	}
 }
 
-func fn2() {
-	for range []int{} {
-		if true {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-			break // want `missing whitespace above this line \(too many lines above branch\)`
-		}
-
-		if true {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-			continue // want `missing whitespace above this line \(too many lines above branch\)`
+func invalidCases() {
+START:
+	fmt.Println("start")
+
+	switch 1 {
+	case 1:
+		for range []int{} {
+			if true {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+				break // want `missing whitespace above this line \(too many lines above branch\)`
+			}
+
+			if true {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+				continue // want `missing whitespace above this line \(too many lines above branch\)`
+			}
+
+			if true {
+				fmt.Println("")
+				fmt.Println("")
+				fmt.Println("")
+				goto START // want `missing whitespace above this line \(too many lines above branch\)`
+			}
 		}
 
-		if true {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-			fallthrough // want `missing whitespace above this line \(too many lines above branch\)`
-		}
-
-		if true {
-			fmt.Println("")
-			fmt.Println("")
-			fmt.Println("")
-			goto START // want `missing whitespace above this line \(too many lines above branch\)`
-		}
+		fmt.Println("")
+		fmt.Println("")
+		fmt.Println("")
+		fallthrough // want `missing whitespace above this line \(too many lines above branch\)`
+	case 2:
 	}
 }