diff --git a/examples/hot_reload/bounce.v b/examples/hot_reload/bounce.v
index a2017b08e8..2c1c3ff5e3 100644
--- a/examples/hot_reload/bounce.v
+++ b/examples/hot_reload/bounce.v
@@ -9,7 +9,7 @@ import glfw
 import time
 
 struct Game {
-mut: 
+mut:
 	gg       &gg.GG
 	x        int
 	y        int
@@ -26,24 +26,24 @@ fn main() {
 	width := 600
 	height := 300
 	mut game := &Game{
-		gg: 0 
-		dx: 2 
-		dy: 2 
-		height: height 
-		width: width 
+		gg: 0
+		dx: 2
+		dy: 2
+		height: height
+		width: width
 	}
-	mut window := glfw.create_window(glfw.WinCfg {
-		width: width 
-		height: height 
-		borderless: false 
+	window := glfw.create_window(glfw.WinCfg {
+		width: width
+		height: height
+		borderless: false
 		title: 'Hot code reloading demo'
-		ptr: game 
-		always_on_top: true 
-	}) 
+		ptr: game
+		always_on_top: true
+	})
 	//window.onkeydown(key_down)
-	game.main_wnd = window 
+	game.main_wnd = window
 	window.make_context_current()
-	gg.init_gg() 
+	gg.init_gg()
 	game.gg = gg.new_context(gg.Cfg {
 		width: width
 		height: height
@@ -67,7 +67,7 @@ const (
 
 [live]
 fn (game &Game) draw() {
-	game.gg.draw_rect(game.x, game.y, width, width, gx.rgb(255, 0, 0)) 
+	game.gg.draw_rect(game.x, game.y, width, width, gx.rgb(255, 0, 0))
 }
 
 fn (game mut Game) run() {
diff --git a/vlib/builtin/array_test.v b/vlib/builtin/array_test.v
index b551cfd785..629963b2c0 100644
--- a/vlib/builtin/array_test.v
+++ b/vlib/builtin/array_test.v
@@ -262,8 +262,8 @@ fn test_push_many() {
 }
 
 fn test_reverse() {
-  mut a := [1, 2, 3, 4]
-	mut b := ['test', 'array', 'reverse']
+	a := [1, 2, 3, 4]
+	b := ['test', 'array', 'reverse']
 	c := a.reverse()
 	d := b.reverse()
 	for i, _  in c {
diff --git a/vlib/builtin/string_test.v b/vlib/builtin/string_test.v
index dcf98255eb..27875907c6 100644
--- a/vlib/builtin/string_test.v
+++ b/vlib/builtin/string_test.v
@@ -172,7 +172,7 @@ fn test_replace() {
 	assert b.replace('B', '') == 'onetwothree'
 	b = '**char'
 	assert b.replace('*char', 'byteptr') == '*byteptr'
-	mut c :='abc'
+	c :='abc'
 	assert c.replace('','-') == c
 }
 
@@ -403,7 +403,7 @@ fn test_capitalize() {
 }
 
 fn test_title() {
-	mut s := 'hello world'
+	s := 'hello world'
 	assert s.title() == 'Hello World'
 	s.to_upper()
 	assert s.title() == 'Hello World'
@@ -500,6 +500,7 @@ fn test_atoi() {
 
 fn test_raw_inter() {
 	world := 'world'
+	println(world)
 	s := r'hello\n$world'
 	assert s == r'hello\n$world'
 	assert s.contains('$')
diff --git a/vlib/math/complex/complex_test.v b/vlib/math/complex/complex_test.v
index 1cc26abb45..42c70a641d 100644
--- a/vlib/math/complex/complex_test.v
+++ b/vlib/math/complex/complex_test.v
@@ -134,7 +134,7 @@ fn test_complex_angle(){
 	assert (c.angle() * 180 / math.pi).eq(135)
 	c = cmplx.complex(-1, -1)
 	assert (c.angle() * 180 / math.pi).eq(-135)
-	mut cc := c.conjugate()
+	cc := c.conjugate()
 	assert (cc.angle() + c.angle()).eq(0)
 }
 
diff --git a/vlib/math/fractions/fraction_test.v b/vlib/math/fractions/fraction_test.v
index dda5250664..28a8a961f0 100644
--- a/vlib/math/fractions/fraction_test.v
+++ b/vlib/math/fractions/fraction_test.v
@@ -147,7 +147,7 @@ fn test_fraction_equals() {
 }
 
 fn test_gcd_and_reduce(){
-	mut f := fractions.fraction(3, 9)
+	f := fractions.fraction(3, 9)
 	assert f.gcd() == 3
-	assert f.reduce().equals(fractions.fraction(1, 3)) 
+	assert f.reduce().equals(fractions.fraction(1, 3))
 }
diff --git a/vlib/net/socket_test.v b/vlib/net/socket_test.v
index a98b31ad3d..a3c7ce6025 100644
--- a/vlib/net/socket_test.v
+++ b/vlib/net/socket_test.v
@@ -1,14 +1,14 @@
 import net
 
 fn test_socket() {
-	mut server := net.listen(0) or {
+	server := net.listen(0) or {
 		panic(err)
 	}
 	server_port := server.get_port()
-	mut client := net.dial('127.0.0.1', server_port) or {
+	client := net.dial('127.0.0.1', server_port) or {
 		panic(err)
 	}
-	mut socket := server.accept() or {
+	socket := server.accept() or {
 		panic(err)
 	}