From f8461e2b3ccbe87635cface142e7d8347bf3820c Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Wed, 29 Jun 2022 17:03:56 +0800
Subject: [PATCH] parser: check const declaration using multiple assign
 (#14886)

---
 vlib/v/parser/parser.v                 |  3 +++
 vlib/v/parser/tests/const_decl_err.out |  7 +++++++
 vlib/v/parser/tests/const_decl_err.vv  | 12 ++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 vlib/v/parser/tests/const_decl_err.out
 create mode 100644 vlib/v/parser/tests/const_decl_err.vv

diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index b4d8b4b165..26ec2e3f25 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -3364,6 +3364,9 @@ fn (mut p Parser) const_decl() ast.ConstDecl {
 				pos)
 		}
 		full_name := p.prepend_mod(name)
+		if p.tok.kind == .comma {
+			p.error_with_pos('const declaration do not support multiple assign yet', p.tok.pos())
+		}
 		p.check(.assign)
 		end_comments << p.eat_comments()
 		if p.tok.kind == .key_fn {
diff --git a/vlib/v/parser/tests/const_decl_err.out b/vlib/v/parser/tests/const_decl_err.out
new file mode 100644
index 0000000000..bf9db23091
--- /dev/null
+++ b/vlib/v/parser/tests/const_decl_err.out
@@ -0,0 +1,7 @@
+vlib/v/parser/tests/const_decl_err.vv:6:3: error: const declaration do not support multiple assign yet
+    4 |
+    5 | const (
+    6 |     a, b, c = foo()
+      |      ^
+    7 | )
+    8 |
diff --git a/vlib/v/parser/tests/const_decl_err.vv b/vlib/v/parser/tests/const_decl_err.vv
new file mode 100644
index 0000000000..324d61b5ce
--- /dev/null
+++ b/vlib/v/parser/tests/const_decl_err.vv
@@ -0,0 +1,12 @@
+fn foo() (int, int, int) {
+	return 1, 2, 3
+}
+
+const (
+	a, b, c = foo()
+)
+
+
+fn main() {
+	println("$a $b $c")
+}