fix: in operator

* remove `In` trait, `__in__`, `__notin__` function
* desugar to `__contains__`
* impl Collection for Array, Set, Tuple

crates/erg_compiler/lib/std/_erg_contains_operator.py

@@ -3,7 +3,9 @@ from _erg_range import Range
 
 from collections import namedtuple
 
-def in_operator(elem, y):
+# (elem in y) == contains_operator(y, elem)
+def contains_operator(y, elem):
+    # 1 in Int
     if type(y) == type:
         if isinstance(elem, y):
             return True
@@ -11,22 +13,27 @@ def in_operator(elem, y):
             return True
         # TODO: trait check
         return False
-    elif isinstance(y, list) and (
+    # [1] in [Int]
+    elif isinstance(y, list) and isinstance(elem, list) and (
         type(y[0]) == type or isinstance(y[0], Range)
     ):
         # FIXME:
-        type_check = in_operator(elem[0], y[0])
+        type_check = contains_operator(y[0], elem[0])
         len_check = len(elem) == len(y)
         return type_check and len_check
-    elif isinstance(y, tuple):
+    # (1, 2) in (Int, Int)
+    elif isinstance(y, tuple) and isinstance(elem, tuple) and (
+        type(y[0]) == type or isinstance(y[0], Range)
+    ):
         if not hasattr(elem, "__iter__"):
             return False
-        type_check = all(map(lambda x: in_operator(x[0], x[1]), zip(elem, y)))
+        type_check = all(map(lambda x: contains_operator(x[0], x[1]), zip(y, elem)))
         len_check = len(elem) == len(y)
         return type_check and len_check
-    elif isinstance(y, dict) and isinstance(next(iter(y.keys())), type):
+    # {1: 2} in {Int: Int}
+    elif isinstance(y, dict) and isinstance(elem, dict) and isinstance(next(iter(y.keys())), type):
         # TODO:
-        type_check = True  # in_operator(x[next(iter(x.keys()))], next(iter(y.keys())))
+        type_check = True  # contains_operator(next(iter(y.keys())), x[next(iter(x.keys()))])
         len_check = len(elem) >= len(y)
         return type_check and len_check
     else:

crates/erg_compiler/lib/std/_erg_std_prelude.py

@@ -16,7 +16,7 @@ from _erg_str import Str, StrMut
 from _erg_array import Array
 from _erg_dict import Dict
 from _erg_set import Set
-from _erg_in_operator import in_operator
+from _erg_contains_operator import contains_operator
 from _erg_mutate_operator import mutate_operator