From 8a5ca4cbdcde2795a06ad7c1e3322018e59cdb23 Mon Sep 17 00:00:00 2001
From: joe-conigliaro <joe@vlang.io>
Date: Fri, 19 Jun 2020 21:31:33 +1000
Subject: [PATCH] checker: error if variable used before decleration p1

---
 vlib/v/checker/checker.v | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 7474a02049..f4118f7cbb 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -2084,6 +2084,9 @@ pub fn (mut c Checker) ident(mut ident ast.Ident) table.Type {
 					return obj.typ
 				}
 				ast.Var {
+					if ident.pos.pos < obj.pos.pos {
+						c.error('variable `$ident.name` used before decleration', ident.pos)
+					}
 					mut typ := obj.typ
 					if typ == 0 {
 						if obj.expr is ast.Ident {