update tests and examples after the mutability fix

examples/hot_reload/bounce.v

@@ -32,7 +32,7 @@ fn main() {
 		height: height
 		width: width
 	}
-	mut window := glfw.create_window(glfw.WinCfg {
+	window := glfw.create_window(glfw.WinCfg {
 		width: width
 		height: height
 		borderless: false

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 {

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('$')

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)
 }
 

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))
 }

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)
 	}