From 162c42dbe91eeb1230c6ba45818d59e3dbf97a76 Mon Sep 17 00:00:00 2001
From: BigBlack <dhdony@gmail.com>
Date: Thu, 4 Feb 2021 15:14:43 +0800
Subject: [PATCH] ast: fix `new_struct := MyStruct{...(*old_struct)}` (#8544)

---
 vlib/v/ast/ast.v           | 2 ++
 vlib/v/tests/struct_test.v | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/vlib/v/ast/ast.v b/vlib/v/ast/ast.v
index 56bfafddce..ac9b4ad523 100644
--- a/vlib/v/ast/ast.v
+++ b/vlib/v/ast/ast.v
@@ -1254,6 +1254,8 @@ pub fn (expr Expr) is_lvalue() bool {
 		CTempVar { return true }
 		IndexExpr { return expr.left.is_lvalue() }
 		SelectorExpr { return expr.expr.is_lvalue() }
+		ParExpr { return expr.expr.is_lvalue() } // for var := &{...(*pointer_var)}
+		PrefixExpr { return expr.right.is_lvalue() }
 		else {}
 	}
 	return false
diff --git a/vlib/v/tests/struct_test.v b/vlib/v/tests/struct_test.v
index ab50fccbd8..8eba8b8a0f 100644
--- a/vlib/v/tests/struct_test.v
+++ b/vlib/v/tests/struct_test.v
@@ -170,6 +170,14 @@ fn test_assoc_with_vars() {
 	}
 	assert merged.a == 42
 	assert merged.b == 7
+
+	def3 := &Def{ 100, 200 }
+	merged1 := Def{...(*def3)}
+	merged2 := &Def{...(*def3)}
+	assert merged1.a == 100
+	assert merged1.b == 200
+	assert merged2.a == 100
+	assert merged2.b == 200
 }
 
 const (