修复了大量存在的问题，增加了假鸭子类型等等机制

Test/GenericTest/temp/16e1f65b154831e8.pyi

@@ -0,0 +1,64 @@
+"""
+Auto-generated Python stub file from main.py
+Module: main
+"""
+
+import c
+
+
+import t
+import stdio
+import testcheck
+
+def add[T](a: T, b: T) -> T: pass
+
+def test_generic_add() -> t.CInt: pass
+
+def combine[T1, T2](a: T1, b: T2) -> T1: pass
+
+def test_generic_combine() -> t.CInt: pass
+
+def max_val[T](a: T, b: T) -> T: pass
+
+def test_generic_max() -> t.CInt: pass
+
+
+class Box[T]:
+    value: T
+    def __init__(self: Box, v: T) -> t.CInt: pass
+    def get(self: Box) -> T: pass
+    def set(self: Box, v: T) -> t.CInt: pass
+
+def test_generic_box() -> t.CInt: pass
+
+
+class Pair[T1, T2]:
+    first: T1
+    second: T2
+    def __init__(self: Pair, a: T1, b: T2) -> t.CInt: pass
+    def sum_as_int(self: Pair) -> t.CInt: pass
+
+def test_generic_pair() -> t.CInt: pass
+
+def test_fixed_array() -> t.CInt: pass
+
+def test_char_array() -> t.CInt: pass
+
+def identity[T](x: T) -> T: pass
+
+def test_generic_identity() -> t.CInt: pass
+
+def double_val[T](x: T) -> T: pass
+
+def test_generic_nested() -> t.CInt: pass
+
+
+class Counter[T]:
+    count: T
+    def __init__(self: Counter, start: T) -> t.CInt: pass
+    def increment(self: Counter) -> t.CInt: pass
+    def get_count(self: Counter) -> T: pass
+
+def test_generic_counter() -> t.CInt: pass
+
+def main() -> t.CInt: pass