Merge branch 'master' into preallocate-helper-rtuple

Author: BobTheBuidler

docs/source/command_line.rst

@@ -372,7 +372,7 @@ definitions or calls.
 
 .. option:: --untyped-calls-exclude
 
-    This flag allows to selectively disable :option:`--disallow-untyped-calls`
+    This flag allows one to selectively disable :option:`--disallow-untyped-calls`
     for functions and methods defined in specific packages, modules, or classes.
     Note that each exclude entry acts as a prefix. For example (assuming there
     are no type annotations for ``third_party_lib`` available):
@@ -562,7 +562,7 @@ potentially problematic or redundant in some way.
 
 .. option:: --deprecated-calls-exclude
 
-    This flag allows to selectively disable :ref:`deprecated<code-deprecated>` warnings
+    This flag allows one to selectively disable :ref:`deprecated<code-deprecated>` warnings
     for functions and methods defined in specific packages, modules, or classes.
     Note that each exclude entry acts as a prefix. For example (assuming ``foo.A.func`` is deprecated):
 

docs/source/error_code_list.rst

@@ -1032,8 +1032,8 @@ Warn about top level await expressions [top-level-await]
 This error code is separate from the general ``[syntax]`` errors, because in
 some environments (e.g. IPython) a top level ``await`` is allowed. In such
 environments a user may want to use ``--disable-error-code=top-level-await``,
-that allows to still have errors for other improper uses of ``await``, for
-example:
+which allows one to still have errors for other improper uses of ``await``,
+for example:
 
 .. code-block:: python
 

docs/source/mypy_daemon.rst

@@ -252,16 +252,16 @@ command.
 Statically inspect expressions
 ******************************
 
-The daemon allows to get declared or inferred type of an expression (or other
+The daemon allows one to get the declared or inferred type of an expression (or other
 information about an expression, such as known attributes or definition location)
-using ``dmypy inspect LOCATION`` command. The location of the expression should be
+using the ``dmypy inspect LOCATION`` command. The location of the expression should be
 specified in the format ``path/to/file.py:line:column[:end_line:end_column]``.
 Both line and column are 1-based. Both start and end position are inclusive.
 These rules match how mypy prints the error location in error messages.
 
 If a span is given (i.e. all 4 numbers), then only an exactly matching expression
 is inspected. If only a position is given (i.e. 2 numbers, line and column), mypy
-will inspect all *expressions*, that include this position, starting from the
+will inspect all expressions that include this position, starting from the
 innermost one.
 
 Consider this Python code snippet:

mypy/traverser.py

@@ -504,7 +504,7 @@ class ExtendedTraverserVisitor(TraverserVisitor):
     In addition to the base traverser it:
         * has visit_ methods for leaf nodes
         * has common method that is called for all nodes
-        * allows to skip recursing into a node
+        * allows skipping recursing into a node
 
     Note that this traverser still doesn't visit some internal
     mypy constructs like _promote expression and Var.

mypy/type_visitor.py

@@ -51,7 +51,7 @@
     get_proper_type,
 )
 
-T = TypeVar("T")
+T = TypeVar("T", covariant=True)
 
 
 @trait

mypy/types.py

@@ -3938,8 +3938,12 @@ def visit_type_alias_type(self, t: TypeAliasType, /) -> list[mypy.nodes.TypeAlia
         assert t.alias is not None
         if t.alias not in self.seen_alias_nodes:
             self.seen_alias_nodes.add(t.alias)
-            return [t.alias] + t.alias.target.accept(self)
-        return []
+            res = [t.alias] + t.alias.target.accept(self)
+        else:
+            res = []
+        for arg in t.args:
+            res.extend(arg.accept(self))
+        return res
 
 
 def is_named_instance(t: Type, fullnames: str | tuple[str, ...]) -> TypeGuard[Instance]:

test-data/unit/check-recursive-types.test

@@ -1014,3 +1014,12 @@ from bogus import Foo  # type: ignore
 
 A = Callable[[Foo, "B"], Foo]  # E: Type alias target becomes "Callable[[Any, B], Any]" due to an unfollowed import
 B = Callable[[Foo, A], Foo]  # E: Type alias target becomes "Callable[[Any, A], Any]" due to an unfollowed import
+
+[case testRecursiveAliasOnArgumentDetected]
+from typing import TypeVar
+
+T = TypeVar("T")
+L = list[T]
+
+A = L[A]
+a: A = 1  # E: Incompatible types in assignment (expression has type "int", variable has type "A")