Implemented constant folding

tests/programs_test.go

@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"git.akyoto.dev/cli/q/src/build"
+	"git.akyoto.dev/cli/q/src/build/config"
 	"git.akyoto.dev/go/assert"
 )
 
@@ -52,11 +53,21 @@ var programs = []struct {
 }
 
 func TestPrograms(t *testing.T) {
+	config.ConstantFold = false
+
 	for _, test := range programs {
 		t.Run(test.Name, func(t *testing.T) {
 			run(t, filepath.Join("programs", test.Name+".q"), test.Input, test.Output, test.ExitCode)
 		})
 	}
+
+	config.ConstantFold = true
+
+	for _, test := range programs {
+		t.Run(test.Name+" (optimized)", func(t *testing.T) {
+			run(t, filepath.Join("programs", test.Name+".q"), test.Input, test.Output, test.ExitCode)
+		})
+	}
 }
 
 func BenchmarkPrograms(b *testing.B) {