#2107 cl: extend compileSendStmt

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

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)
+}

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 ()

cl/stmt.go

@@ -274,15 +274,22 @@ 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
 	}
 	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()
 }