examples: fix path_tracing.v compilation, using (*ptr) = expression

examples/game_of_life/modules/automaton/automaton.v

@@ -12,7 +12,7 @@ pub mut:
 	unsafe {
 		mut e := &int(0)
 		e = a.data + y*a.maxx + x
-		*e = newval
+		(*e) = newval
 	}
 }
 [inline] pub fn (a &A2D) get(x,y int) int {

examples/path_tracing.v

@@ -101,7 +101,7 @@ fn new_image(w int, h int) Image {
 // write out a .ppm file
 fn (image Image) save_as_ppm(file_name string) {
 	npixels := image.width * image.height
-	mut f_out := os.create(file_name) or { exit }
+	mut f_out := os.create(file_name) or { panic(err) }
 	f_out.writeln('P3')
 	f_out.writeln('${image.width} ${image.height}')
 	f_out.writeln('255')
@@ -247,8 +247,8 @@ const(
 
 struct Cache {
 mut:
-	sin_tab [cache_len]f64
-	cos_tab [cache_len]f64
+	sin_tab [65536]f64
+	cos_tab [65536]f64
 }
 
 fn new_tabs() Cache {
@@ -429,7 +429,7 @@ fn ray_trace(w int, h int, samps int, file_name string, scene_id int) Image {
                         r = r + radiance(Ray{cam.o+d.mult_s(140.0), d.norm()}, 0, scene_id).mult_s(samps1)
 					}
 					tmp_vec := Vec{clamp(r.x),clamp(r.y),clamp(r.z)}.mult_s(.25)
-					*ivec = *ivec + tmp_vec
+					(*ivec) = *ivec + tmp_vec
 				}
 			}
 		}

vlib/crypto/aes/aes_cbc.v

@@ -74,7 +74,7 @@ pub fn (x &AesCbc) encrypt_blocks(dst mut []byte, src_ []byte) {
 		} else {
 			src = src[x.block_size..]
 		}
-		*dst = dst[x.block_size..]
+		(*dst) = dst[x.block_size..]
 	}
 
 	// Save the iv for the next crypt_blocks call.

vlib/crypto/rc4/rc4.v

@@ -63,13 +63,11 @@ pub fn (c mut Cipher) xor_key_stream(dst mut []byte, src []byte) {
 	if src.len == 0 {
 		return
 	}
-	if subtle.inexact_overlap(dst[..src.len], src) {
+	if subtle.inexact_overlap(dst, src) {
 		panic('crypto.rc4: invalid buffer overlap')
 	}
 	mut i := c.i
 	mut j := c.j
-	_ = dst[src.len-1]
-	*dst = dst[..src.len] // eliminate bounds check from loop
 	for k, v in src {
 		i += byte(1)
 		x := c.s[i]

vlib/hash/wyhash/rand.v

@@ -4,15 +4,12 @@
 module wyhash
 
 pub fn rand_u64(seed &u64) u64 {
-	// QTODO
-	/*
 	mut seed0 := seed
 	unsafe{
 		mut seed1 := *seed0
-		seed1+=wyp0
-		*seed0 = seed1
+		seed1 += (wyp0)
+		(*seed0) = seed1
 		return wymum(seed1^wyp1, seed1)
 	}	
-	*/
 	return 0
 }

vlib/hash/wyhash/wyhash_test.v

@@ -29,8 +29,6 @@ fn test_wyhash() {
 }
 
 fn test_rand_u64() {	
-	// QTODO
-	/*
 	seed := u64(111)
 	mut rand_nos := []u64
 	for _ in 0..40 {
@@ -40,6 +38,5 @@ fn test_rand_u64() {
 		}
 		rand_nos << rand_no
 	}	
-	*/
 	assert true
 }