checker: allow int alias to be used as array len and cap (fix #23266) (#23272)

Author: Delta456

vlib/v/checker/containers.v

@@ -312,7 +312,7 @@ fn (mut c Checker) check_array_init_default_expr(mut node ast.ArrayInit) {
 }
 
 fn (mut c Checker) check_array_init_para_type(para string, mut expr ast.Expr, pos token.Pos) {
-	sym := c.table.sym(c.unwrap_generic(c.expr(mut expr)))
+	sym := c.table.final_sym(c.unwrap_generic(c.expr(mut expr)))
 	if sym.kind !in [.int, .int_literal] {
 		c.error('array ${para} needs to be an int', pos)
 	}

vlib/v/tests/array_len_int_alias_test.v

@@ -0,0 +1,7 @@
+type Test = int
+
+fn test_array_len_int_alias() {
+	x := Test(12)
+	arr := []int{len: x}
+	assert arr.len == 12
+}