From 1037d3a383625acd3fa9f79e2c0646b0fea4a874 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@vlang.io>
Date: Wed, 2 Dec 2020 23:58:06 +0100
Subject: [PATCH] checker: make missing `mut` before an argument a warning

---
 vlib/v/checker/checker.v | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index fdcb095225..bf1ccb7e9e 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -1294,7 +1294,7 @@ pub fn (mut c Checker) call_method(mut call_expr ast.CallExpr) table.Type {
 			} else {
 				if param.is_mut && (!arg.is_mut || param.typ.share() != arg.share) {
 					tok := arg.share.str()
-					c.error('`$call_expr.name` parameter `$param.name` is `$tok`, you need to provide `$tok` e.g. `$tok arg${i +
+					c.warn('`$call_expr.name` parameter `$param.name` is `$tok`, you need to provide `$tok` e.g. `$tok arg${i +
 						1}`', arg.expr.position())
 				}
 			}
@@ -1566,7 +1566,7 @@ pub fn (mut c Checker) call_fn(mut call_expr ast.CallExpr) table.Type {
 		} else {
 			if arg.is_mut && (!call_arg.is_mut || arg.typ.share() != call_arg.share) {
 				tok := call_arg.share.str()
-				c.error('`$call_expr.name` parameter `$arg.name` is `$tok`, you need to provide `$tok` e.g. `$tok arg${i +
+				c.warn('`$call_expr.name` parameter `$arg.name` is `$tok`, you need to provide `$tok` e.g. `$tok arg${i +
 					1}`', call_arg.expr.position())
 			}
 		}