From dc3ad28984b8355c91a50d33c09d73fa4c8abf49 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Sat, 22 Feb 2025 08:54:03 +0800
Subject: [PATCH 1/2] #2107 cl: extend compileSendStmt

---
 cl/_testgop/{append => append1}/in.gop |  0
 cl/_testgop/{append => append1}/out.go |  0
 cl/_testgop/append2/in.gop             |  7 +++++++
 cl/_testgop/append2/out.go             | 12 ++++++++++++
 cl/stmt.go                             | 11 +++++++++--
 5 files changed, 28 insertions(+), 2 deletions(-)
 rename cl/_testgop/{append => append1}/in.gop (100%)
 rename cl/_testgop/{append => append1}/out.go (100%)
 create mode 100644 cl/_testgop/append2/in.gop
 create mode 100644 cl/_testgop/append2/out.go

diff --git a/cl/_testgop/append/in.gop b/cl/_testgop/append1/in.gop
similarity index 100%
rename from cl/_testgop/append/in.gop
rename to cl/_testgop/append1/in.gop
diff --git a/cl/_testgop/append/out.go b/cl/_testgop/append1/out.go
similarity index 100%
rename from cl/_testgop/append/out.go
rename to cl/_testgop/append1/out.go
diff --git a/cl/_testgop/append2/in.gop b/cl/_testgop/append2/in.gop
new file mode 100644
index 000000000..39d9a2b9f
--- /dev/null
+++ b/cl/_testgop/append2/in.gop
@@ -0,0 +1,7 @@
+a := [1, 2, 3]
+a <- 4, 5
+echo a
+
+b := [7, 8]
+a <- b...
+echo a
diff --git a/cl/_testgop/append2/out.go b/cl/_testgop/append2/out.go
new file mode 100644
index 000000000..238884c87
--- /dev/null
+++ b/cl/_testgop/append2/out.go
@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := []int{1, 2, 3}
+	a = append(a, 4, 5)
+	fmt.Println(a)
+	b := []int{7, 8}
+	a = append(a, b...)
+	fmt.Println(a)
+}
diff --git a/cl/stmt.go b/cl/stmt.go
index b2cc98176..48d92bb09 100644
--- a/cl/stmt.go
+++ b/cl/stmt.go
@@ -274,7 +274,11 @@ func compileSendStmt(ctx *blockCtx, expr *ast.SendStmt) {
 			for _, v := range vals {
 				compileExpr(ctx, v)
 			}
-			cb.CallWith(len(vals)+1, 0, expr).AssignWith(1, 1, expr)
+			flags := gogen.InstrFlags(0)
+			if expr.Ellipsis != 0 { // a = append(a, b...)
+				flags |= gogen.InstrFlagEllipsis
+			}
+			cb.CallWith(len(vals)+1, flags, expr).AssignWith(1, 1, expr)
 			return
 		}
 		goto normal
@@ -282,7 +286,10 @@ func compileSendStmt(ctx *blockCtx, expr *ast.SendStmt) {
 	compileExpr(ctx, ch)
 
 normal:
-	compileExpr(ctx, vals[0]) // TODO(xsw): issue #2107
+	if len(vals) != 1 || expr.Ellipsis != 0 {
+		panic(ctx.newCodeError(vals[0].End(), "can't send multiple values to a channel"))
+	}
+	compileExpr(ctx, vals[0])
 	ctx.cb.Send()
 }
 

From 1fe01a347d9e003f2d5df299b3799f675eb1bd24 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Sat, 22 Feb 2025 08:58:44 +0800
Subject: [PATCH 2/2] TestErrSendStmt

---
 cl/error_msg_test.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cl/error_msg_test.go b/cl/error_msg_test.go
index 6341a7004..a9553ee39 100644
--- a/cl/error_msg_test.go
+++ b/cl/error_msg_test.go
@@ -37,6 +37,13 @@ func codeErrorTestAst(t *testing.T, pkgname, filename, msg, src string) {
 	cltest.ErrorAst(t, pkgname, filename, msg, src)
 }
 
+func TestErrSendStmt(t *testing.T) {
+	codeErrorTest(t, `bar.gop:3:8: can't send multiple values to a channel`, `
+	var a chan int
+	a <- 1, 2
+`)
+}
+
 func TestErrVargCommand(t *testing.T) {
 	codeErrorTest(t, `bar.gop:5:1: not enough arguments in call to Ls
 	have ()