checker: more checks for in and !in

vlib/v/checker/checker.v

@@ -399,24 +399,23 @@ pub fn (mut c Checker) infix_expr(mut infix_expr ast.InfixExpr) table.Type {
 				.array {
 					right_sym := c.table.get_type_symbol(right.array_info().elem_type)
 					if 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)
+						c.error('the data type on the left of `$infix_expr.op.str()` does not match the array item type',
+						infix_expr.pos)
 					}
 				}
 				.map {
 					key_sym := c.table.get_type_symbol(right.map_info().key_type)
 					if left.kind != key_sym.kind {
-						c.error('the data type on the left of `in` does not match the map key type',
-							infix_expr.pos)
+						c.error('the data type on the left of `$infix_expr.op.str()` does not match the map key type', infix_expr.pos)
 					}
 				}
 				.string {
 					if left.kind != .string {
-						c.error('the data type on the left of `in` must be a string', infix_expr.pos)
+						c.error('the data type on the left of `$infix_expr.op.str()` must be a string', infix_expr.pos)
 					}
 				}
 				else {
-					c.error('`in` can only be used with an array/map/string', infix_expr.pos)
+					c.error('`$infix_expr.op.str()` can only be used with an array/map/string', infix_expr.pos)
 				}
 			}
 			return table.bool_type

vlib/v/checker/tests/in_mismatch_type.out

@@ -54,3 +54,24 @@ vlib/v/checker/tests/in_mismatch_type.v:31:9: error: the data type on the left o
       |            ~~
    32 |         println('all right')
    33 |     }
+vlib/v/checker/tests/in_mismatch_type.v:34:7: error: the data type on the left of `!in` does not match the array item type
+   32 |         println('all right')
+   33 |     }
+   34 |     if 1 !in a_s {
+      |          ~~~
+   35 |         println('ok')
+   36 |     }
+vlib/v/checker/tests/in_mismatch_type.v:37:9: error: the data type on the left of `!in` does not match the array item type 
+   35 |         println('ok')
+   36 |     }
+   37 |     if '1' !in a_i {
+      |            ~~~
+   38 |         println('good')
+   39 |     }
+vlib/v/checker/tests/in_mismatch_type.v:41:7: error: the data type on the left of `!in` does not match the map key type
+   39 |     }
+   40 |
+   41 |     if 5 !in m {
+      |          ~~~
+   42 |         println('yay')
+   43 |     }

vlib/v/checker/tests/in_mismatch_type.vv

@@ -31,4 +31,14 @@ fn main() {
 	if '2' in a_i {
 		println('all right')
 	}
+	if 1 !in a_s {
+		println('ok')
+	}
+	if '1' !in a_i {
+		println('good')
+	}
+
+	if 5 !in m {
+		println('yay')
+	}
 }