From 79eaad4bbb778b04501fca724ce2641e25b33f3a Mon Sep 17 00:00:00 2001
From: Marc Vertes <mvertes@free.fr>
Date: Fri, 23 Jan 2026 09:23:51 +0100
Subject: chore: use parser.Token.Arg to store generated parameters

---
 comp/compiler.go           | 17 ++++++++---------
 interp/interpreter_test.go |  1 +
 parser/parse.go            |  3 +--
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/comp/compiler.go b/comp/compiler.go
index 614e80a..ba114da 100644
--- a/comp/compiler.go
+++ b/comp/compiler.go
@@ -319,8 +319,7 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 		case lang.JumpFalse:
 			var i int
 			if s, ok := c.Symbols[t.Str]; !ok {
-				// t.Beg contains the position in code which needs to be fixed.
-				t.Beg = len(c.Code)
+				t.Arg = []any{len(c.Code)} // current code location
 				fixList = append(fixList, t)
 			} else {
 				i = int(s.Value.Int()) - len(c.Code)
@@ -330,8 +329,7 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 		case lang.JumpSetFalse:
 			var i int
 			if s, ok := c.Symbols[t.Str]; !ok {
-				// t.Beg contains the position in code which needs to be fixed.
-				t.Beg = len(c.Code)
+				t.Arg = []any{len(c.Code)} // current code location
 				fixList = append(fixList, t)
 			} else {
 				i = int(s.Value.Int()) - len(c.Code)
@@ -341,8 +339,7 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 		case lang.JumpSetTrue:
 			var i int
 			if s, ok := c.Symbols[t.Str]; !ok {
-				// t.Beg contains the position in code which needs to be fixed.
-				t.Beg = len(c.Code)
+				t.Arg = []any{len(c.Code)} // current code location
 				fixList = append(fixList, t)
 			} else {
 				i = int(s.Value.Int()) - len(c.Code)
@@ -352,7 +349,7 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 		case lang.Goto:
 			var i int
 			if s, ok := c.Symbols[t.Str]; !ok {
-				t.Beg = len(c.Code)
+				t.Arg = []any{len(c.Code)} // current code location
 				fixList = append(fixList, t)
 			} else {
 				i = int(s.Value.Int()) - len(c.Code)
@@ -430,7 +427,8 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 			emit(t, vm.Stop)
 
 		case lang.Return:
-			emit(t, vm.Return, t.Beg, t.End)
+			numOut, numIn := t.Arg[0].(int), t.Arg[1].(int)
+			emit(t, vm.Return, numOut, numIn)
 
 		case lang.Slice:
 			if stack[len(stack)-3].IsInt() {
@@ -452,7 +450,8 @@ func (c *Compiler) Generate(tokens parser.Tokens) (err error) {
 		if !ok {
 			return fmt.Errorf("label not found: %q", t.Str)
 		}
-		c.Code[t.Beg].Arg[0] = int(s.Value.Int()) - t.Beg
+		loc := t.Arg[0].(int)
+		c.Code[loc].Arg[0] = int(s.Value.Int()) - loc // relative code position
 	}
 	return err
 }
diff --git a/interp/interpreter_test.go b/interp/interpreter_test.go
index f5c347b..89ab4ae 100644
--- a/interp/interpreter_test.go
+++ b/interp/interpreter_test.go
@@ -128,6 +128,7 @@ func TestFor(t *testing.T) {
 		{src: "func f() int {a := 0; for {a = a+1; if a < 3 {continue}; break}; return a}; f()", res: "3"},       // #04
 		{src: "a := []int{1,2,3,4}; b := 0; for i := range a {b = b+i}; b", res: "6"},                            // #05
 		{src: "func f() int {a := []int{1,2,3,4}; b := 0; for i := range a {b = b+i}; return b}; f()", res: "6"}, // #06
+		// {src: "a := []int{1,2,3,4}; b := 0; for i, e := range a {b = b+i+e}; b", res: "6"},                       // #07
 	})
 }
 
diff --git a/parser/parse.go b/parser/parse.go
index 95179be..daf30ca 100644
--- a/parser/parse.go
+++ b/parser/parse.go
@@ -497,8 +497,7 @@ func (p *Parser) parseReturn(in Tokens) (out Tokens, err error) {
 	// TODO: the function symbol should be already present in the parser context.
 	// otherwise no way to handle anonymous func.
 	s := p.function
-	in[0].Beg = s.Type.Rtype.NumOut()
-	in[0].End = s.Type.Rtype.NumIn()
+	in[0].Arg = []any{s.Type.Rtype.NumOut(), s.Type.Rtype.NumIn()}
 	out = append(out, in[0])
 	return out, err
 }
-- 
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