checker: fix type mismatch of `in` array

vlib/v/checker/checker.v

@@ -294,6 +294,12 @@ pub fn (c mut Checker) infix_expr(infix_expr mut ast.InfixExpr) table.Type {
 		if !(right.kind in [.array, .map, .string]) {
 			c.error('`in` can only be used with an array/map/string.', infix_expr.pos)
 		}
+		if right.kind == .array {
+			right_sym := c.table.get_type_symbol(right.array_info().elem_type)
+			if left.kind != .alias && left.kind != right_sym.kind {
+				c.error('the data type on the left of `in` does not match the array item type.', infix_expr.pos)
+			}
+		}
 		return table.bool_type
 	}
 	if !c.table.check(right_type, left_type) {

vlib/v/checker/tests/inout/in_array_mismatch_type.out

@@ -0,0 +1,6 @@
+vlib/v/checker/tests/inout/in_array_mismatch_type.v:2:7: error: the data type on the left of `in` does not match the array item type.
+    1| fn main() {
+    2|     if 1 in ['1', '2'] {
+                ~~
+    3|         println('ok')
+    4|     }

vlib/v/checker/tests/inout/in_array_mismatch_type.vv

@@ -0,0 +1,5 @@
+fn main() {
+	if 1 in ['1', '2'] {
+		println('ok')
+	}
+}