v: fix build and failing tests on arm64 (#12840)

cmd/tools/vtest-self.v

@@ -131,7 +131,15 @@ const (
 		'do_not_remove',
 	]
 	skip_on_non_amd64             = [
-		'vlib/v/tests/closure_test.v' /* not implemented yet */,
+		// closures aren't implemented yet:
+		'vlib/v/tests/closure_test.v',
+		'vlib/context/cancel_test.v',
+		'vlib/context/deadline_test.v',
+		'vlib/context/empty_test.v',
+		'vlib/context/value_test.v',
+		'vlib/context/onecontext/onecontext_test.v',
+		'vlib/sync/once_test.v',
+		'vlib/sync/many_times_test.v',
 		'do_not_remove',
 	]
 )

vlib/builtin/int_test.v

@@ -131,7 +131,12 @@ fn test_bin() {
 	x5 := byte(0b11111111)
 	assert x5 == 255
 	x6 := char(0b11111111)
-	assert int(x6) == -1
+	// C.char is unsigned on arm64, but signed on amd64, by default
+	$if arm64 {
+		assert int(x6) == 255
+	} $else {
+		assert int(x6) == -1
+	}
 	x7 := 0b0
 	assert x7 == 0
 	x8 := -0b0

vlib/math/complex/complex_test.v

@@ -142,7 +142,8 @@ fn test_complex_angle() {
 	c = cmplx.complex(-1, -1)
 	assert c.angle() * 180 / math.pi == -135
 	cc := c.conjugate()
-	assert cc.angle() + c.angle() == 0
+	a := cc.angle()
+	assert a + c.angle() == 0
 }
 
 fn test_complex_addinv() {

vlib/v/transformer/transformer.v

@@ -287,7 +287,8 @@ pub fn (mut t Transformer) check_safe_array(mut node ast.IndexExpr) {
 	name := node.left
 	match index {
 		ast.IntegerLiteral {
-			node.is_direct = t.index.safe_access(name.str(), index.val.int())
+			is_direct := t.index.safe_access(name.str(), index.val.int())
+			node.is_direct = is_direct
 		}
 		ast.RangeExpr {
 			if index.has_high {