diff --git a/src/cmd/compile/internal/escape/call.go b/src/cmd/compile/internal/escape/call.go
index 9e5abed591..63e790a786 100644
--- a/src/cmd/compile/internal/escape/call.go
+++ b/src/cmd/compile/internal/escape/call.go
@@ -337,7 +337,11 @@ func (e *escape) rewriteArgument(argp *ir.Node, init *ir.Nodes, call ir.Node, fn
 	if arg := *argp; arg.Op() == ir.OSLICELIT {
 		list := arg.(*ir.CompLitExpr).List
 		for i := range list {
-			visit(arg.Pos(), &list[i])
+			el := &list[i]
+			if list[i].Op() == ir.OKEY {
+				el = &list[i].(*ir.KeyExpr).Value
+			}
+			visit(arg.Pos(), el)
 		}
 	} else {
 		visit(call.Pos(), argp)
diff --git a/test/fixedbugs/issue49240.go b/test/fixedbugs/issue49240.go
new file mode 100644
index 0000000000..26929fe1a2
--- /dev/null
+++ b/test/fixedbugs/issue49240.go
@@ -0,0 +1,11 @@
+// compile
+
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func f() {
+	go copy([]int{1: 0}, []int{})
+}