Fix overridden method of Some returning Any

CHANGELOG.md

@@ -11,6 +11,7 @@ See [0Ver](https://0ver.org/).
 
 - Add `python3.15` support
 - Add `mypy>=1.19,<2.5` support
+- Fix overridden method of `Some` returning `Any`
 
 
 ## 0.29.1 WIP

returns/maybe.py

@@ -346,41 +346,43 @@ def __repr__(self):
         """
         return '<Nothing>'
 
-    def map(self, function):
-        """Does nothing for ``Nothing``."""
-        return self
+    if not TYPE_CHECKING:  # noqa: WPS604  # pragma: no branch
 
-    def apply(self, container):
-        """Does nothing for ``Nothing``."""
-        return self
+        def map(self, function):
+            """Does nothing for ``Nothing``."""
+            return self
 
-    def bind(self, function):
-        """Does nothing for ``Nothing``."""
-        return self
+        def apply(self, container):
+            """Does nothing for ``Nothing``."""
+            return self
 
-    def bind_optional(self, function):
-        """Does nothing."""
-        return self
+        def bind(self, function):
+            """Does nothing for ``Nothing``."""
+            return self
 
-    def lash(self, function):
-        """Composes this container with a function returning container."""
-        return function(None)
+        def bind_optional(self, function):
+            """Does nothing."""
+            return self
 
-    def value_or(self, default_value):
-        """Returns default value."""
-        return default_value
+        def lash(self, function):
+            """Composes this container with a function returning container."""
+            return function(None)
 
-    def or_else_call(self, function):
-        """Returns the result of a passed function."""
-        return function()
+        def value_or(self, default_value):
+            """Returns default value."""
+            return default_value
 
-    def unwrap(self):
-        """Raises an exception, since it does not have a value inside."""
-        raise UnwrapFailedError(self)
+        def or_else_call(self, function):
+            """Returns the result of a passed function."""
+            return function()
 
-    def failure(self) -> None:
-        """Returns failed value."""
-        return self._inner_value
+        def unwrap(self):
+            """Raises an exception, since it does not have a value inside."""
+            raise UnwrapFailedError(self)
+
+        def failure(self) -> None:
+            """Returns failed value."""
+            return self._inner_value
 
     def __bool__(self):
         """Returns ``False``."""
@@ -417,29 +419,29 @@ def unwrap(self):
             """Returns inner value for successful container."""
             return self._inner_value
 
-    def map(self, function):
-        """Composes current container with a pure function."""
-        return Some(function(self._inner_value))
+        def map(self, function):
+            """Composes current container with a pure function."""
+            return Some(function(self._inner_value))
 
-    def apply(self, container):
-        """Calls a wrapped function in a container on this container."""
-        if isinstance(container, Some):
-            return self.map(container.unwrap())  # type: ignore
-        return container
+        def apply(self, container):
+            """Calls a wrapped function in a container on this container."""
+            if isinstance(container, Some):
+                return self.map(container.unwrap())  # type: ignore
+            return container
 
-    def lash(self, function):
-        """Does nothing for ``Some``."""
-        return self
+        def lash(self, function):
+            """Does nothing for ``Some``."""
+            return self
 
-    def value_or(self, default_value):
-        """Returns inner value for successful container."""
-        return self._inner_value
+        def value_or(self, default_value):
+            """Returns inner value for successful container."""
+            return self._inner_value
 
-    def or_else_call(self, function):
-        """Returns inner value for successful container."""
-        return self._inner_value
+        def or_else_call(self, function):
+            """Returns inner value for successful container."""
+            return self._inner_value
 
-    def failure(self):
+    def failure(self) -> Never:
         """Raises exception for successful container."""
         raise UnwrapFailedError(self)
 

typesafety/test_maybe/test_maybe_type.yml

@@ -157,3 +157,19 @@
     from returns.maybe import Some
 
     reveal_type(Some(1).unwrap())  # N: Revealed type is "int"
+
+
+- case: some_methods
+  disable_cache: false
+  main: |
+    from returns.maybe import Some
+
+    def fallback() -> str:
+        ...
+
+    reveal_type(Some(1).map(str))  # N: Revealed type is "returns.maybe.Maybe[str]"
+    reveal_type(Some(1).apply(Some(float)))  # N: Revealed type is "returns.maybe.Maybe[float]"
+    reveal_type(Some(1).lash(lambda _: Some(2)))  # N: Revealed type is "returns.maybe.Maybe[int]"
+    reveal_type(Some(1).value_or(None))  # N: Revealed type is "int | None"
+    reveal_type(Some(1).or_else_call(fallback))  # N: Revealed type is "int | str"
+    reveal_type(Some(1).failure())  # N: Revealed type is "Never"