From 55f32fc4138ffea59be37f33f9335824817aeb59 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Fri, 6 Dec 2019 19:23:24 +0300
Subject: [PATCH] more mutability fixes

---
 examples/game_of_life/modules/automaton/automaton.v | 4 ++--
 vlib/compiler/if_match.v                            | 1 +
 vlib/sync/waitgroup.v                               | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/examples/game_of_life/modules/automaton/automaton.v b/examples/game_of_life/modules/automaton/automaton.v
index ab94405ab8..8bb1d015a9 100644
--- a/examples/game_of_life/modules/automaton/automaton.v
+++ b/examples/game_of_life/modules/automaton/automaton.v
@@ -39,7 +39,7 @@ pub mut:
 }
 
 fn new_automaton(f [][]int) Automaton {
-	mut maxy := f.len
+	maxy := f.len
 	mut maxx := 0
 	for y := 0; y<f.len; y++ {
 		if maxx < f[y].len {
@@ -61,7 +61,7 @@ pub fn (aa mut Automaton) update() {
 	for y := 1; y<aa.field.maxy; y++ {
 		for x := 1; x<aa.field.maxx; x++ {
 			moore_sum := ( 0 +
-				aa.field.get(x-1,y-1) + aa.field.get(x,y-1) + aa.field.get(x+1,y-1) +	
+				aa.field.get(x-1,y-1) + aa.field.get(x,y-1) + aa.field.get(x+1,y-1) +
 				aa.field.get(x-1,y  ) + 0                   + aa.field.get(x+1,y  ) +
 				aa.field.get(x-1,y+1) + aa.field.get(x,y+1) + aa.field.get(x+1,y+1)
 			)
diff --git a/vlib/compiler/if_match.v b/vlib/compiler/if_match.v
index cf982a2e04..7a7e069359 100644
--- a/vlib/compiler/if_match.v
+++ b/vlib/compiler/if_match.v
@@ -258,6 +258,7 @@ fn (p mut Parser) if_statement(is_expr bool, elif_depth int) string {
 			name: var_name
 			typ: typ
 			is_mut: false // TODO
+			is_used: true // TODO
 			//is_alloc: p.is_alloc || typ.starts_with('array_')
 			//line_nr: p.tokens[ var_token_idx ].line_nr
 			//token_idx: var_token_idx
diff --git a/vlib/sync/waitgroup.v b/vlib/sync/waitgroup.v
index 35a8f358a6..193ef16c69 100644
--- a/vlib/sync/waitgroup.v
+++ b/vlib/sync/waitgroup.v
@@ -30,7 +30,7 @@ pub fn (wg mut WaitGroup) done() {
 	wg.add(-1)
 }
 
-pub fn (wg mut WaitGroup) wait() {
+pub fn (wg &WaitGroup) wait() {
 	for wg.active > 0 {
 		// Do not remove this, busy empty loops are optimized
 		// with -prod by some compilers, see issue #2874