From b15780ae51e9aa313b333c406db62976b3e9183d Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Thu, 16 Apr 2020 12:00:05 +0800
Subject: [PATCH] parser: better const error

---
 vlib/v/parser/parser.v | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 6e0fdcd40c..d804bfb2f4 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -1514,7 +1514,10 @@ fn (p mut Parser) const_decl() ast.ConstDecl {
 	}
 	pos := p.tok.position()
 	p.check(.key_const)
-	p.check(.lpar)
+	if p.tok.kind != .lpar {
+		p.error('consts must be grouped, e.g.\nconst (\n\ta = 1\n)')
+	}
+	p.next() // (
 	var fields := []ast.ConstField
 	for p.tok.kind != .rpar {
 		if p.tok.kind == .comment {