Support bound variables (struct literals)

Factor out unaryexpression parsing
Fix package bleed between tests

v3/internal/parser/testdata/struct_literal_single/main.go

@@ -160,6 +160,10 @@ func (*GreetService) StructPointerInputErrorOutput(in *Person) error {
 	return nil
 }
 
+func (*GreetService) StructInputStructOutput(in Person) Person {
+	return in
+}
+
 func (*GreetService) StructPointerInputStructPointerOutput(in *Person) *Person {
 	return in
 }

v3/internal/parser/testdata/variable_single/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	_ "embed"
+	"github.com/wailsapp/wails/v3/pkg/application"
+	"log"
+)
+
+// GreetService is great
+type GreetService struct {
+	SomeVariable int
+	lowerCase    string
+}
+
+// Greet someone
+func (*GreetService) Greet(name string) string {
+	return "Hello " + name
+}
+
+func main() {
+	greetService := &GreetService{}
+	app := application.New(application.Options{
+		Bind: []interface{}{
+			greetService,
+		},
+	})
+
+	app.NewWebviewWindow()
+
+	err := app.Run()
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+}