Add tests for for loop analysis

analyzer/control-flow_test.go

@@ -109,3 +109,47 @@ testString (test,
 }
 `)
 }
+
+func TestFor (test *testing.T) {
+testString (test,
+`
+[f str:String] = for c:Byte in str { }
+[g str:String] = for i:Index c:Byte in str { }
+`)}
+
+func TestForBreak (test *testing.T) {
+testString (test,
+`
+[f str:String]:Byte = for c:Byte in str [break c]
+`)}
+
+func TestForBreakBadType (test *testing.T) {
+testStringErr (test,
+"expected Byte", 2, 56,
+`
+[f str:String]:Byte = for i:Index c:Byte in str [break i]
+`)}
+
+func TestForErrBadIndex (test *testing.T) {
+testStringErr (test,
+"expected Index", 2, 22,
+`
+[f str:String] = for i:Int c:Byte in str { }
+`)}
+
+func TestForErrBadOver (test *testing.T) {
+testStringErr (test,
+"cannot use U8 as Int", 2, 31,
+`
+[f str:String] = for c:Int in str { }
+`)}
+
+func TestForErrDeclarationScoped (test *testing.T) {
+testStringErr (test,
+"no variable named c", 4, 2,
+`
+[f str:String] = {
+	for c:Byte in str { }
+	c = 'a'
+}
+`)}