examples: fix `v build-examples`

examples/concurrency/concurrency.v

@@ -2,7 +2,7 @@ import sync
 import time
 
 // Simulate expensive computing using sleep function
-fn expensive_computing(id, duration int, wg &sync.WaitGroup) {
+fn expensive_computing(id, duration int, mut wg sync.WaitGroup) {
 	println('Executing expensive computing task (${id})...')
 	time.sleep_ms(duration)
 	println('Finish task ${id} on ${duration} ms')
@@ -10,11 +10,11 @@ fn expensive_computing(id, duration int, wg &sync.WaitGroup) {
 }
 
 fn main() {
-	wg := sync.new_waitgroup()
+	mut wg := sync.new_waitgroup()
 	wg.add(3)
-	go expensive_computing(1, 100, wg)
+	go expensive_computing(1, 100, mut wg)
-	go expensive_computing(2, 500, wg)
+	go expensive_computing(2, 500, mut wg)
-	go expensive_computing(3, 1000, wg)
+	go expensive_computing(3, 1000, mut wg)
 	// Join all tasks
 	wg.wait()
 	println('All jobs finished!')

examples/concurrency/concurrency_http.v

@@ -2,7 +2,7 @@ import net.http
 import sync
 import time
 
-fn vlang_time(wg &sync.WaitGroup) ?string {
+fn vlang_time(mut wg sync.WaitGroup) ?string {
 	start := time.ticks()
 	data := http.get('https://vlang.io/utc_now')?
 	finish := time.ticks()
@@ -12,7 +12,7 @@ fn vlang_time(wg &sync.WaitGroup) ?string {
 	return data.text
 }
 
-fn remote_ip(wg &sync.WaitGroup) ?string {
+fn remote_ip(mut wg sync.WaitGroup) ?string {
 	start := time.ticks()
 	data := http.get('https://api.ipify.org')?
 	finish := time.ticks()
@@ -23,10 +23,10 @@ fn remote_ip(wg &sync.WaitGroup) ?string {
 }
 
 fn main() {
-	wg := sync.new_waitgroup()
+	mut wg := sync.new_waitgroup()
 	wg.add(2)
 	// Run tasks async
-	go vlang_time(wg)
+	go vlang_time(mut wg)
-	go remote_ip(wg)
+	go remote_ip(mut wg)
 	wg.wait()
 }

examples/nbody.v

@@ -119,14 +119,11 @@ fn arr_position() []Position {
 }
 
 fn main() {
-
+	mut sys := &System {arr_momentum(), arr_position()}
-sys := &System {arr_momentum(), arr_position()}
+	offsetmomentum(mut sys)
-offsetmomentum(mut sys)
+	println('${energy(sys):.9f}')  //-0.169075164
-
+	for _ in 0..50_000_000 {
-println('${energy(sys):.9f}')  //-0.169075164
-for _ in 0..50000000 {
 		advance(mut sys, 0.01)
-}
+	}
-println('${energy(sys):.9f}') //-0.169059907
+	println('${energy(sys):.9f}') //-0.169059907
-
 }

examples/pico/pico.v

@@ -46,5 +46,6 @@ fn callback(req picohttpparser.Request, mut res picohttpparser.Response) {
 }
 
 fn main() {
+	println('Starting webserver on http://127.0.0.1:8088/ ...')
 	picoev.new(8088, &callback).serve()
 }

examples/sokol/freetype_raven.v

@@ -128,7 +128,7 @@ const (
 black = C.sfons_rgba(0, 0, 0, 255)
 )
 
-fn (state &AppState) render_font() {
+fn (mut state AppState) render_font() {
 	lh := 30
 	mut dy := lh
 	if !state.inited {

examples/tetris/tetris.v

@@ -137,7 +137,7 @@ struct Game {
 const ( fpath = os.resource_abs_path('../assets/fonts/RobotoMono-Regular.ttf') )
 
 [if showfps]
-fn (game &Game) showfps() {
+fn (mut game Game) showfps() {
 	game.frame++
 	last_frame_ms := f64(game.frame_sw.elapsed().microseconds())/1000.0
 	ticks := f64(game.second_sw.elapsed().microseconds())/1000.0
@@ -149,7 +149,7 @@ fn (game &Game) showfps() {
 	}
 }
 
-fn frame(game &Game) {
+fn frame(mut game Game) {
 	game.frame_sw.restart()
 	game.gg.begin()
 	game.draw_scene()
@@ -301,7 +301,7 @@ fn (mut g Game) get_tetro() {
 }
 
 // TODO mut
-fn (g &Game) drop_tetro() {
+fn (mut g Game) drop_tetro() {
 	for i in 0..tetro_size{
 		tetro := g.tetro[i]
 		x := tetro.x + g.pos_x

vlib/picoev/picoev.v

@@ -165,12 +165,13 @@ fn rw_callback(loop &C.picoev_loop, fd, events int, cb_arg voidptr) {
 			for {
 				pret := req.parse_request(s, 100)
 				if pret <= 0 && s.len > 0 {
-					C.memmove(buf, s.str, s.len)
+					unsafe { C.memmove(buf, s.str, s.len) }
 					p.idx[fd] = s.len
 					p.oidx[fd] = int(res.buf) - int(res.buf_start)
 					break
 				}
-				if req.method.str[0]==`p` || req.method.str[0]==`P` || req.method.str[0]==`d` || req.method.str[0]==`D`  {
+				c0 := unsafe { req.method.str[0] }
+				if c0 ==`p` || c0 == `P` || c0 == `d` || c0 == `D`  {
 					mut j := 0
 					for {
 						if j == req.num_headers {
@@ -238,7 +239,7 @@ pub fn new(port int, cb voidptr) &Picoev {
 
 	C.picoev_init(max_fds)
 	loop := C.picoev_create_loop(max_timeout)
-	pv := &Picoev{
+	mut pv := &Picoev{
 		loop: loop
 		cb: cb
 		date: C.get_date()

vlib/picohttpparser/response.v

@@ -9,7 +9,7 @@ pub mut:
 	buf byteptr
 }
 
-[inline] [unsafe_fn]
+[inline]
 fn (mut r Response) write_str(s string) {
 	unsafe {
 		C.memcpy(r.buf, s.str, s.len)