tests: update for stricter type checks

vlib/math/bits/bits_test.v

@@ -89,12 +89,12 @@ fn test_bits(){
 
 	// 8 bit
 	i = 0
-	for x in 0..9 {
+	for _ in 0..9 {
 		mut rv := byte(0)
 		mut bc := 0
 		mut n := i
 		for bc < 8 {
-			rv = (rv << 1) | (n & 0x01)
+			rv = (rv << 1) | (byte(n) & 0x01)
 			bc++
 			n = n >> 1
 		}
@@ -105,12 +105,12 @@ fn test_bits(){
 
 	// 16 bit
 	i = 0
-	for x in 0..17 {
+	for _ in 0..17 {
 		mut rv := u16(0)
 		mut bc := 0
 		mut n := i
 		for bc < 16 {
-			rv = (rv << 1) | (n & 0x01)
+			rv = (rv << 1) | (u16(n) & 0x01)
 			bc++
 			n = n >> 1
 		}
@@ -121,12 +121,12 @@ fn test_bits(){
 
 	// 32 bit
 	i = 0
-	for x in 0..33 {
+	for _ in 0..33 {
 		mut rv := u32(0)
 		mut bc := 0
 		mut n := i
 		for bc < 32 {
-			rv = (rv << 1) | (n & 0x01)
+			rv = (rv << 1) | (u32(n) & 0x01)
 			bc++
 			n = n >> 1
 		}
@@ -137,7 +137,7 @@ fn test_bits(){
 
 	// 64 bit
 	i1 = 0
-	for x in 0..64 {
+	for _ in 0..64 {
 		mut rv := u64(0)
 		mut bc := 0
 		mut n := i1

vlib/math/fractions/approximations.v

@@ -56,7 +56,7 @@ fn eval_cf(whole i64, den []i64) Fraction {
 		}
 		else {
 			last := count - 1
-			mut n := 1
+			mut n := i64(1)
 			mut d := den[last]
 			// The calculations are done from back to front
 			for index := count - 2; index >= 0; index-- {
@@ -90,7 +90,7 @@ pub fn approximate_with_eps(val, eps f64) Fraction {
 	// The integer part is separated first. Then we process the fractional
 	// part to generate numerators and denominators in tandem.
 	whole := i64(val)
-	mut frac := val - whole
+	mut frac := val - f64(whole)
 	// Quick exit for integers
 	if frac == 0.0 {
 		return fraction(whole, 1)
@@ -113,7 +113,7 @@ pub fn approximate_with_eps(val, eps f64) Fraction {
 		if math.fabs(val - partial.f64()) < eps {
 			return partial
 		}
-		frac -= den
+		frac -= f64(den)
 	}
 	panic("Couldn\'t converge. Please create an issue on https://github.com/vlang/v")
 }

vlib/math/math_test.v

@@ -56,7 +56,7 @@ fn test_gamma() {
 
 fn test_mod() {
 	assert 4 % 2 == 0
-	x := 2
+	x := u64(2)
 	assert u64(5) % x == 1
 	mut a := 10
 	a %= 2