test-data/unit/typexport-basic.test

-- Test cases for exporting node types from the type checker.
--
-- Each test case consists of at least two sections.
-- The first section contains [case NAME] followed by the input code,
-- while the second section contains [out] followed by the output from the type
-- checker.
--
-- The first line of input code should be a regexp in comment that describes
-- the information to dump (prefix with ##). The regexp is matched against
-- the following items:
--
--   * each name of an expression node
--   * each type string of a node (e.g. OpExpr)
--
-- Lines starting with "--" in this file will be ignored.


-- Expressions
-- -----------


[case testConstructorCall]
import typing
A()
B()
class A: pass
class B: pass
[out]
CallExpr(2) : A
NameExpr(2) : def () -> A
CallExpr(3) : B
NameExpr(3) : def () -> B

[case testLiterals]
import typing
5
2.3
'foo'
[builtins fixtures/primitives.pyi]
[out]
IntExpr(2) : Literal[5]?
FloatExpr(3) : builtins.float
StrExpr(4) : Literal['foo']?

[case testNameExpression]

a = None # type: A
a # node
def f(aa: 'A') -> None:
  b = None # type: B
  aa # node
  b  # node
class A:
  def g(self) -> None:
    self # node
class B: pass
[out]
NameExpr(3) : A
NameExpr(6) : A
NameExpr(7) : B
NameExpr(10) : A

[case testEllipsis]
import typing
...
[out]
EllipsisExpr(2) : builtins.ellipsis

[case testMemberAccess]
## MemberExpr|CallExpr

a = None # type: A
a.m
a.f
a.f()
class A:
  m = None # type: A
  def f(self) -> 'B': pass
class B: pass
[out]
MemberExpr(4) : A
MemberExpr(5) : def () -> B
CallExpr(6) : B
MemberExpr(6) : def () -> B

[case testCastExpression]
## CastExpr|[a-z]
from typing import Any, cast
d = None # type: Any
b = None # type: B
class A: pass
class B(A): pass
cast(A, d)
cast(A, b)
cast(B, b)
[out]
CastExpr(7) : A
NameExpr(7) : Any
CastExpr(8) : A
NameExpr(8) : B
CastExpr(9) : B
NameExpr(9) : B

[case testAssertTypeExpr]
## AssertTypeExpr|[a-z]
from typing import Any, assert_type
d = None # type: Any
a = None # type: A
b = None # type: B
class A: pass
class B(A): pass
assert_type(d, Any)
assert_type(a, A)
assert_type(b, B)
[out]
AssertTypeExpr(8) : Any
NameExpr(8) : Any
AssertTypeExpr(9) : A
NameExpr(9) : A
AssertTypeExpr(10) : B
NameExpr(10) : B

[case testArithmeticOps]
## OpExpr
import typing
a = 1 + 2
1.2 * 3
2.2 - 3
1 / 2
[file builtins.py]
class object:
    def __init__(self) -> None: pass
class function: pass
class int:
    def __add__(self, x: int) -> int: pass
    def __truediv__(self, x: int) -> float: pass
class float:
    def __mul__(self, x: int) -> float: pass
    def __sub__(self, x: int) -> float: pass
class type: pass
class str: pass
[out]
OpExpr(3) : builtins.int
OpExpr(4) : builtins.float
OpExpr(5) : builtins.float
OpExpr(6) : builtins.float

[case testComparisonOps]
## ComparisonExpr
import typing
1 == object()
1 == 2
2 < 3
1 < 2 < 3
8 > 3
4 < 6 > 2
[file builtins.py]
class object:
    def __init__(self) -> None: pass
class int:
    def __eq__(self, x: object) -> bool: pass
    def __lt__(self, x: int) -> bool: pass
    def __gt__(self, x: int) -> int: pass
class bool: pass
class type: pass
class function: pass
class str: pass
[out]
ComparisonExpr(3) : builtins.bool
ComparisonExpr(4) : builtins.bool
ComparisonExpr(5) : builtins.bool
ComparisonExpr(6) : builtins.bool
ComparisonExpr(7) : builtins.int
ComparisonExpr(8) : builtins.object

[case testBooleanOps]
## OpExpr|UnaryExpr
import typing
a = 1
a and a
a or a
not a
[builtins fixtures/bool.pyi]
[out]
OpExpr(4) : builtins.int
OpExpr(5) : builtins.int
UnaryExpr(6) : builtins.bool

[case testBooleanOpsOnBools]
## OpExpr|UnaryExpr
import typing
a = bool()
a and a
a or a
not a
[builtins fixtures/bool.pyi]
[out]
OpExpr(4) : builtins.bool
OpExpr(5) : builtins.bool
UnaryExpr(6) : builtins.bool

[case testFunctionCall]
## CallExpr
from typing import Tuple
f(
  A(),
  B())
class A: pass
class B: pass
def f(a: A, b: B) -> Tuple[A, B]: pass
[builtins fixtures/tuple-simple.pyi]
[out]
CallExpr(3) : Tuple[A, B]
CallExpr(4) : A
CallExpr(5) : B


-- Statements
-- ----------


[case testSimpleAssignment]
from typing import Any
a = None # type: A
b = a # type: Any
if b:
    b = a
    a = b

class A: pass
[out]
NameExpr(3) : A
NameExpr(4) : Any
NameExpr(5) : A
NameExpr(5) : Any
NameExpr(6) : A
NameExpr(6) : Any

[case testMemberAssignment]
from typing import Any
class A:
  a = None # type: A
  b = None # type: Any
  def f(self) -> None:
    self.b = self.a
    self.a.a = self.b
[out]
MemberExpr(6) : A
MemberExpr(6) : Any
NameExpr(6) : A
NameExpr(6) : A
MemberExpr(7) : A
MemberExpr(7) : A
MemberExpr(7) : A
NameExpr(7) : A
NameExpr(7) : A

[case testIf]

a = None # type: bool
if a:
  1
elif not a:
  1
[builtins fixtures/bool.pyi]
[out]
NameExpr(3) : builtins.bool
IntExpr(4) : Literal[1]?
NameExpr(5) : Literal[False]
UnaryExpr(5) : builtins.bool
IntExpr(6) : Literal[1]?

[case testWhile]

a = None # type: bool
while a:
  a
[builtins fixtures/bool.pyi]
[out]
NameExpr(3) : builtins.bool
NameExpr(4) : Literal[True]


-- Simple type inference
-- ---------------------


[case testInferSingleType]
import typing
x = ()
[builtins fixtures/primitives.pyi]
[out]
NameExpr(2) : Tuple[]
TupleExpr(2) : Tuple[]

[case testInferTwoTypes]
## NameExpr
import typing
(s,
i) = 'x', 1
[builtins fixtures/primitives.pyi]
[out]
NameExpr(3) : builtins.str
NameExpr(4) : builtins.int

[case testInferSingleLocalVarType]
import typing
def f() -> None:
    x = ()
[builtins fixtures/primitives.pyi]
[out]
NameExpr(3) : Tuple[]
TupleExpr(3) : Tuple[]


-- Basic generics
-- --------------


[case testImplicitBoundTypeVarsForMethod]
## MemberExpr
from typing import TypeVar, Generic
T = TypeVar('T')
class A(Generic[T]):
  def f(self) -> T: pass
class B: pass
def g() -> None:
  a = None # type: A[B]
  f = a.f
[out]
MemberExpr(9) : def () -> B

[case testImplicitBoundTypeVarsForSelfMethodReference]
from typing import TypeVar, Generic
T = TypeVar('T')
class A(Generic[T]):
  def f(self) -> T:
    return self.f()
[out]
CallExpr(5) : T`1
MemberExpr(5) : def () -> T`1
NameExpr(5) : A[T`1]

[case testGenericFunctionCallWithTypeApp-skip]
## CallExpr|TypeApplication|NameExpr
from typing import Any, TypeVar, Tuple
T = TypeVar('T')
class A: pass
f[A](A())
f[Any](A())
def f(a: T) -> Tuple[T, T]: pass
[builtins fixtures/tuple.pyi]
[out]
CallExpr(5) : A
CallExpr(5) : Tuple[A, A]
NameExpr(5) : def () -> A
NameExpr(5) : def (a: A) -> Tuple[A, A]
TypeApplication(5) : def (a: A) -> Tuple[A, A]
CallExpr(6) : A
CallExpr(6) : Tuple[Any, Any]
NameExpr(6) : def () -> A
NameExpr(6) : def (a: Any) -> Tuple[Any, Any]
TypeApplication(6) : def (a: Any) -> Tuple[Any, Any]

-- NOTE: Type applications are not supported for generic methods, so the
--       following test cases are commented out.

--[case testGenericMethodCallWithTypeApp]
--## CallExpr|MemberExpr|TypeApplication
--from typing import Any, TypeVar, Tuple
--T = TypeVar('T')
--class A:
--  def f(self, a: T) -> Tuple[T, T]: pass
--a.f[A](a)
--a.f[Any](a)
--a = None # type: A
--[builtins fixtures/tuple.py]
--[out]
--CallExpr(2) : Tuple[A, A]
--MemberExpr(2) : def (A a) -> Tuple[A, A]
--TypeApplication(2) : def (A a) -> Tuple[A, A]
--CallExpr(3) : Tuple[Any, Any]
--MemberExpr(3) : def (any a) -> Tuple[Any, Any]
--TypeApplication(3) : def (any a) -> Tuple[Any, Any]

--[case testGenericMethodCallInGenericTypeWithTypeApp]
--## CallExpr|MemberExpr|TypeApplication
--from typing import Any, TypeVar, Generic, Tuple
--T = TypeVar('T')
--S = TypeVar('S')
--class B: pass
--class C: pass
--a.f[B](b)
--a.f[Any](b)
--class A(Generic[T]):
--  def f(self, a: S) -> Tuple[T, S]: pass
--a = None # type: A[C]
--b = None # type: B
--[builtins fixtures/tuple.py]
--[out]
--CallExpr(6) : Tuple[C, B]
--MemberExpr(6) : def (B a) -> Tuple[C, B]
--TypeApplication(6) : def (B a) -> Tuple[C, B]
--CallExpr(7) : Tuple[C, Any]
--MemberExpr(7) : def (any a) -> Tuple[C, Any]
--TypeApplication(7) : def (any a) -> Tuple[C, Any]

[case testGenericTypeVariableInference]
from typing import TypeVar, Generic
T = TypeVar('T')
class A(Generic[T]):
  def __init__(self, a: T) -> None: pass
class B: pass
A(A(B()))
[out]
CallExpr(6) : A[A[B]]
CallExpr(6) : A[B]
CallExpr(6) : B
NameExpr(6) : def (a: A[B]) -> A[A[B]]
NameExpr(6) : def (a: B) -> A[B]
NameExpr(6) : def () -> B


-- Generic inheritance
-- -------------------


[case testInheritedMethodReferenceWithGenericInheritance]
from typing import TypeVar, Generic
T = TypeVar('T')
class C: pass
class A(Generic[T]):
  def f(self, a: T) -> None: pass
class B(A[C]):
  def g(self, c: C) -> None:
    self.f(c)
[out]
CallExpr(8) : None
MemberExpr(8) : def (a: C)
NameExpr(8) : C
NameExpr(8) : B

[case testInheritedMethodReferenceWithGenericSubclass]
from typing import TypeVar, Generic
S = TypeVar('S')
T = TypeVar('T')
class C: pass
class A(Generic[S, T]):
  def f(self, a: C) -> None: pass
class B(A[C, T], Generic[T]):
  def g(self, c: C) -> None:
    self.f(c)
[out]
CallExpr(9) : None
MemberExpr(9) : def (a: C)
NameExpr(9) : C
NameExpr(9) : B[T`1]

[case testExternalReferenceWithGenericInheritance]
from typing import TypeVar, Generic
T = TypeVar('T')
class C: pass
class A(Generic[T]):
  def f(self, a: T) -> None: pass
class B(A[C]): pass
b = None # type: B
c = None # type: C
b.f(c)
[out]
CallExpr(9) : None
MemberExpr(9) : def (a: C)
NameExpr(9) : B
NameExpr(9) : C


-- Implicit Any types
-- ------------------


[case testDynamicallyTypedFunction]

def f(x):
  y = x + o
  z = o
  z
o = None # type: object
[out]
NameExpr(3) : builtins.object
NameExpr(3) : Any
NameExpr(3) : Any
OpExpr(3) : Any
NameExpr(4) : builtins.object
NameExpr(4) : Any
NameExpr(5) : Any

[case testDynamicallyTypedMethod]

class A:
  def f(self, x):
    y = (
         o)  # Place y and o on separate lines
    x
    y
o = None # type: object
[out]
NameExpr(4) : Any
NameExpr(5) : builtins.object
NameExpr(6) : Any
NameExpr(7) : Any

[case testDynamicallyTypedConstructor]

class A:
  def __init__(self, x):
    y = o
    x
    y
o = None # type: object
[out]
NameExpr(4) : builtins.object
NameExpr(4) : Any
NameExpr(5) : Any
NameExpr(6) : Any

[case testCallInDynamicallyTypedFunction]

def f():
  g(o)
def g(a: object) -> object: pass
o = None # type: object
[out]
CallExpr(3) : Any
NameExpr(3) : def (a: builtins.object) -> builtins.object
NameExpr(3) : builtins.object

[case testExpressionInDynamicallyTypedFn]
import typing
def f():
  x = None
  x.f()
[out]
CallExpr(4) : Any
MemberExpr(4) : Any
NameExpr(4) : Any

[case testGenericCall]
from typing import TypeVar, Generic
T = TypeVar('T')
def f() -> None:
  a1 = A(b) # type: A[B]
  a2 = A(b) # type: A[object]
class A(Generic[T]):
  def __init__(self, a: T) -> None: pass
class B: pass
b = None # type: B
[out]
CallExpr(4) : A[B]
NameExpr(4) : def (a: B) -> A[B]
NameExpr(4) : B
CallExpr(5) : A[builtins.object]
NameExpr(5) : def (a: builtins.object) -> A[builtins.object]
NameExpr(5) : B

[case testGenericCallInDynamicallyTypedFunction]
from typing import TypeVar, Generic
T = TypeVar('T')
def f():
  A()
class A(Generic[T]): pass
[out]
CallExpr(4) : Any
NameExpr(4) : def [T] () -> A[T`1]

[case testGenericCallInDynamicallyTypedFunction2]
from typing import TypeVar, Generic
T = TypeVar('T')
def f():
  A(f)
class A(Generic[T]):
    def __init__(self, x: T) -> None: pass
[out]
CallExpr(4) : Any
NameExpr(4) : def [T] (x: T`1) -> A[T`1]
NameExpr(4) : def () -> Any

[case testGenericCallInDynamicallyTypedFunction3]
from typing import TypeVar
t = TypeVar('t')
def f():
  g(None)
def g(x: t) -> t: pass
[out]
CallExpr(4) : Any
NameExpr(4) : def [t] (x: t`-1) -> t`-1


-- Generic types and type inference
-- --------------------------------


[case testInferenceInArgumentContext]
## CallExpr
from typing import TypeVar, Generic
T = TypeVar('T')
f(g())
f(h(b))
f(h(c))

b = None # type: B
c = None # type: C

def f(a: 'A[B]') -> None: pass

def g() -> 'A[T]': pass
def h(a: T) -> 'A[T]': pass

class A(Generic[T]): pass
class B: pass
class C(B): pass
[out]
CallExpr(4) : None
CallExpr(4) : A[B]
CallExpr(5) : None
CallExpr(5) : A[B]
CallExpr(6) : None
CallExpr(6) : A[B]

[case testInferGenericTypeForLocalVariable]
from typing import TypeVar, Generic
T = TypeVar('T')
def f() -> None:
  a = A(b)
  a
  a2, a3 = A(b), A(c)
  a2
  a3
b = None # type: B
c = None # type: C
class A(Generic[T]):
  def __init__(self, x: T) -> None: pass
class B: pass
class C: pass
[out]
CallExpr(4) : A[B]
NameExpr(4) : def (x: B) -> A[B]
NameExpr(4) : A[B]
NameExpr(4) : B
NameExpr(5) : A[B]
CallExpr(6) : A[B]
CallExpr(6) : A[C]
NameExpr(6) : def (x: B) -> A[B]
NameExpr(6) : def (x: C) -> A[C]
NameExpr(6) : A[B]
NameExpr(6) : A[C]
NameExpr(6) : B
NameExpr(6) : C
NameExpr(7) : A[B]
NameExpr(8) : A[C]

[case testNestedGenericCalls]
from typing import TypeVar, Generic
T = TypeVar('T')
S = TypeVar('S')
def h() -> None:
  g(f(c))

c = None # type: C

class A(Generic[T]): pass
class B(Generic[T]): pass
class C: pass
def f(a: T) -> A[T]: pass
def g(a: S) -> B[S]: pass
[out]
CallExpr(5) : A[C]
CallExpr(5) : B[A[C]]
NameExpr(5) : C
NameExpr(5) : def (a: C) -> A[C]
NameExpr(5) : def (a: A[C]) -> B[A[C]]

[case testInferListLiterals]
from typing import List
a = [] # type: List[A]
class A: pass
[builtins fixtures/list.pyi]
[out]
ListExpr(2) : builtins.list[A]

[case testInferGenericTypeInTypeAnyContext]
from typing import Any
a = [] # type: Any
[builtins fixtures/list.pyi]
[out]
ListExpr(2) : builtins.list[Any]

[case testHigherOrderFunction]
from typing import TypeVar, Callable, List
t = TypeVar('t')
s = TypeVar('s')
map(
    f,
    [A()])
def map(f: Callable[[t], s], a: List[t]) -> List[s]: pass
class A: pass
class B: pass
def f(a: A) -> B: pass
[builtins fixtures/list.pyi]
[out]
CallExpr(4) : builtins.list[B]
NameExpr(4) : def (f: def (A) -> B, a: builtins.list[A]) -> builtins.list[B]
NameExpr(5) : def (a: A) -> B
CallExpr(6) : A
ListExpr(6) : builtins.list[A]
NameExpr(6) : def () -> A


-- Lambdas
-- -------


[case testLambdaWithTypeInferredFromContext]
from typing import Callable
f = lambda x: x.a # type: Callable[[B], A]
class A: pass
class B:
  a = None # type: A
[out]
LambdaExpr(2) : def (B) -> A
MemberExpr(2) : A
NameExpr(2) : B

[case testLambdaWithInferredType]
## LambdaExpr|NameExpr
import typing
f = lambda: 1
[out]
LambdaExpr(3) : def () -> Literal[1]?
NameExpr(3) : def () -> builtins.int

[case testLambdaWithInferredType2]
## LambdaExpr|NameExpr
import typing
f = lambda: [1]
[builtins fixtures/list.pyi]
[out]
LambdaExpr(3) : def () -> builtins.list[builtins.int]
NameExpr(3) : def () -> builtins.list[builtins.int]

[case testLambdaWithInferredType3]
from typing import List, Callable
f = lambda x: [] # type: Callable[[B], List[A]]
class A: pass
class B:
  a = None # type: A
[builtins fixtures/list.pyi]
[out]
LambdaExpr(2) : def (B) -> builtins.list[A]
ListExpr(2) : builtins.list[A]

[case testLambdaAndHigherOrderFunction]
from typing import TypeVar, Callable, List
t = TypeVar('t')
s = TypeVar('s')
l = None # type: List[A]
map(
  lambda x: f(x), l)
def map(f: Callable[[t], s], a: List[t]) -> List[s]: pass
class A: pass
class B: pass
def f(a: A) -> B: pass
[builtins fixtures/list.pyi]
[out]
CallExpr(5) : builtins.list[B]
NameExpr(5) : def (f: def (A) -> B, a: builtins.list[A]) -> builtins.list[B]
CallExpr(6) : B
LambdaExpr(6) : def (A) -> B
NameExpr(6) : def (a: A) -> B
NameExpr(6) : builtins.list[A]
NameExpr(6) : A

[case testLambdaAndHigherOrderFunction2]
## LambdaExpr|NameExpr|ListExpr
from typing import TypeVar, List, Callable
t = TypeVar('t')
s = TypeVar('s')
l = None # type: List[A]
map(
  lambda x: [f(x)], l)
def map(f: Callable[[t], List[s]], a: List[t]) -> List[s]: pass
class A: pass
class B: pass
def f(a: A) -> B: pass
[builtins fixtures/list.pyi]
[out]
NameExpr(6) : def (f: def (A) -> builtins.list[B], a: builtins.list[A]) -> builtins.list[B]
LambdaExpr(7) : def (A) -> builtins.list[B]
ListExpr(7) : builtins.list[B]
NameExpr(7) : def (a: A) -> B
NameExpr(7) : builtins.list[A]
NameExpr(7) : A

[case testLambdaInListAndHigherOrderFunction]
from typing import TypeVar, Callable, List
t = TypeVar('t')
s = TypeVar('s')
l = None # type: List[A]
map(
  [lambda x: x],
  l)
def map(f: List[Callable[[t], s]], a: List[t]) -> List[s]: pass
class A: pass
[builtins fixtures/list.pyi]
[out]
-- TODO We probably should not silently infer 'Any' types in statically typed
--      context. Perhaps just fail instead?
CallExpr(5) : builtins.list[Any]
NameExpr(5) : def (f: builtins.list[def (A) -> Any], a: builtins.list[A]) -> builtins.list[Any]
LambdaExpr(6) : def (A) -> A
ListExpr(6) : builtins.list[def (A) -> Any]
NameExpr(6) : A
NameExpr(7) : builtins.list[A]

[case testLambdaAndHigherOrderFunction3]
from typing import TypeVar, Callable, List
t = TypeVar('t')
s = TypeVar('s')
l = None # type: List[A]
map(
  lambda x: x.b,
  l)
def map(f: Callable[[t], s], a: List[t]) -> List[s]: pass
class A:
  b = None # type: B
class B: pass
[builtins fixtures/list.pyi]
[out]
CallExpr(5) : builtins.list[B]
NameExpr(5) : def (f: def (A) -> B, a: builtins.list[A]) -> builtins.list[B]
LambdaExpr(6) : def (A) -> B
MemberExpr(6) : B
NameExpr(6) : A
NameExpr(7) : builtins.list[A]

[case testLambdaAndHigherOrderFunctionAndKeywordArgs]
from typing import TypeVar, Callable, List
t = TypeVar('t')
s = TypeVar('s')
l = None # type: List[A]
map(
  a=l,
  f=lambda x: x.b)
def map(f: Callable[[t], s], a: List[t]) -> List[s]: pass
class A:
  b = None # type: B
class B: pass
[builtins fixtures/list.pyi]
[out]
CallExpr(5) : builtins.list[B]
NameExpr(5) : def (f: def (A) -> B, a: builtins.list[A]) -> builtins.list[B]
NameExpr(6) : builtins.list[A]
LambdaExpr(7) : def (A) -> B
MemberExpr(7) : B
NameExpr(7) : A


-- Boolean operations
-- ------------------


[case testBooleanOr]
from typing import List
a = None # type: List[A]
a or []
a = a or []
if int():
    a = [] or a
class A: pass
[builtins fixtures/list.pyi]
[out]
ListExpr(3) : builtins.list[A]
NameExpr(3) : builtins.list[A]
OpExpr(3) : builtins.list[A]
ListExpr(4) : builtins.list[A]
NameExpr(4) : builtins.list[A]
NameExpr(4) : builtins.list[A]
OpExpr(4) : builtins.list[A]
CallExpr(5) : builtins.int
NameExpr(5) : def () -> builtins.int
ListExpr(6) : builtins.list[A]
NameExpr(6) : builtins.list[A]
NameExpr(6) : builtins.list[A]
OpExpr(6) : builtins.list[A]


-- Class attributes
-- ----------------


[case testUnboundMethod]
## MemberExpr
import typing
class A:
    def f(self) -> None: pass
A.f
[out]
MemberExpr(5) : def (self: A)

[case testUnboundMethodWithImplicitSig]
## MemberExpr
import typing
class A:
    def f(self): pass
A.f
[out]
MemberExpr(5) : def (self: A) -> Any

[case testOverloadedUnboundMethod]
## MemberExpr
from typing import overload
class A:
    @overload
    def f(self) -> None: pass
    @overload
    def f(self, __x: object) -> None: pass

    def f(self, *args) -> None: pass
A.f
[builtins fixtures/tuple.pyi]
[out]
MemberExpr(10) : Overload(def (self: A), def (self: A, builtins.object))

[case testOverloadedUnboundMethodWithImplicitSig]
## MemberExpr
from typing import overload
class A:
    @overload
    def f(self): pass
    @overload
    def f(self, __x): pass

    def f(self, *args): pass
A.f
[builtins fixtures/tuple.pyi]
[out]
MemberExpr(10) : Overload(def (self: A) -> Any, def (self: A, Any) -> Any)

[case testUnboundMethodWithInheritance]
## MemberExpr
import typing
class A:
    def __init__(self) -> None: pass
    def f(self) -> None: pass
class B(A):
    pass
B.f
[out]
MemberExpr(8) : def (self: A)

[case testUnboundGenericMethod]
## MemberExpr
from typing import TypeVar
t = TypeVar('t')
class B: pass
class A:
    def f(self, x: t) -> None: pass
A.f(A(), B())
[out]
MemberExpr(7) : def (self: A, x: B)

[case testUnboundMethodOfGenericClass]
## MemberExpr
from typing import TypeVar, Generic
t = TypeVar('t')
class B: pass
class A(Generic[t]):
    def f(self, x: t) -> None: pass
A.f
a_b = A() # type: A[B]
A.f(a_b, B())
[out]
MemberExpr(7) : def [t] (self: A[t`1], x: t`1)
MemberExpr(9) : def (self: A[B], x: B)

[case testUnboundOverloadedMethodOfGenericClass]
## CallExpr
from typing import TypeVar, Generic, overload
t = TypeVar('t')
class B: pass
class A(Generic[t]):
    @overload
    def f(self, x: t) -> t: pass
    @overload
    def f(self) -> object: pass
    def f(self, *args): pass

ab, b = None, None # type: (A[B], B)
A.f(ab, b)
[builtins fixtures/tuple.pyi]
[out]
CallExpr(13) : B

[case testUnboundMethodOfGenericClassWithImplicitSig]
## MemberExpr
from typing import TypeVar, Generic
t = TypeVar('t')
class B: pass
class A(Generic[t]):
    def f(self, x): pass
A.f(None, None)
[out]
MemberExpr(7) : def (self: A[t`1], x: Any) -> Any

[case testGenericMethodOfGenericClass]
## MemberExpr
from typing import TypeVar, Generic
t = TypeVar('t')
s = TypeVar('s')
class B: pass
class A(Generic[t]):
    def f(self, y: s) -> None: pass
ab = None # type: A[B]
o = None # type: object
A.f(ab, o)
[out]
MemberExpr(10) : def (self: A[B], y: builtins.object)


-- Type variables with value restriction
-- -------------------------------------


[case testTypeVariableWithValueRestriction]
## NameExpr
from typing import TypeVar
T = TypeVar('T', int, str)
def f(x: T) -> None: pass
f(1)
f('x')
[out]
NameExpr(5) : def (x: builtins.int)
NameExpr(6) : def (x: builtins.str)

[case testTypeVariableWithValueRestrictionAndSubtype]
## NameExpr|CallExpr
from typing import TypeVar
T = TypeVar('T', int, str)
def f(x: T) -> T: pass
class S(str): pass
s = None # type: S
f(s)
[out]
CallExpr(7) : builtins.str
NameExpr(7) : def (x: builtins.str) -> builtins.str
NameExpr(7) : S


-- Binary operations
-- -----------------


[case testBinaryOperatorWithAnyLeftOperand]
## OpExpr
from typing import Any, cast
class B:
    def __add__(self, x: int) -> str: pass
class A:
    def __radd__(self, x: B) -> int: pass
cast(Any, 1) + A()
B() + A()
[out]
OpExpr(7) : Any
OpExpr(8) : builtins.int

[case testBinaryOperatorWithAnyRightOperand]
## OpExpr
from typing import Any, cast
class A:
    def __add__(self, x: str) -> int: pass
A() + cast(Any, 1)
[out]
OpExpr(5) : Any


-- Callable overloading
-- --------------------


[case testOverloadedFunctionType]
## CallExpr
from typing import overload
@overload
def f(x: int) -> str: pass
@overload
def f(x: str) -> int: pass
def f(x): pass
f(1)
f('')
[out]
CallExpr(8) : builtins.str
CallExpr(9) : builtins.int

[case testOverlappingOverloadedFunctionType]
## CallExpr
from typing import overload, Any
class A: pass
class B(A): pass
@overload
def f(x: B) -> B: pass
@overload
def f(x: A) -> A: pass

def f(x) -> Any: pass

a = None # type: A
b = None # type: B
f(a)
f(b)
[out]
CallExpr(14) : A
CallExpr(15) : B



[case testOverloadedErasedType]
from typing import Callable
from typing import List
from typing import overload
from typing import TypeVar

T = TypeVar("T")
V = TypeVar("V")

def fun(s: int) -> int: pass

def m(fun: Callable[[T], V], iter: List[T]) -> None: pass

nums = [1] # type: List[int]
m(fun,
  nums)
[builtins fixtures/list.pyi]
[out]
IntExpr(13) : Literal[1]?
ListExpr(13) : builtins.list[builtins.int]
CallExpr(14) : None
NameExpr(14) : def (s: builtins.int) -> builtins.int
NameExpr(14) : def (fun: def (builtins.int) -> builtins.int, iter: builtins.list[builtins.int])
NameExpr(15) : builtins.list[builtins.int]


-- Special cases
-- -------------


[case testImplicitDataAttributeInit]
## NameExpr
import typing
class A:
    def __init__(self) -> None:
        self.x = (
                  A())
[out]
NameExpr(5) : A
NameExpr(6) : def () -> A

[case testListMultiplicationInContext]
## ListExpr|OpExpr|IntExpr
from typing import List
a = [None] * 3 # type: List[str]
[builtins fixtures/list.pyi]
[out]
IntExpr(3) : Literal[3]?
ListExpr(3) : builtins.list[builtins.str]
OpExpr(3) : builtins.list[builtins.str]

[case testStringFormatting]
## IntExpr|OpExpr|StrExpr
'%d' % 1
[builtins fixtures/primitives.pyi]
[typing fixtures/typing-medium.pyi]
[out]
IntExpr(2) : Literal[1]?
OpExpr(2) : builtins.str
StrExpr(2) : Literal['%d']?

[case testExportOverloadArgType]
## LambdaExpr|NameExpr
from typing import List, overload, Callable
@overload
def f(x: int, f: Callable[[int], int]) -> None: ...
@overload
def f(x: str, f: Callable[[str], str]) -> None: ...
def f(x): ...
f(
    1, lambda x: x)
[builtins fixtures/list.pyi]
[out]
NameExpr(8) : Overload(def (x: builtins.int, f: def (builtins.int) -> builtins.int), def (x: builtins.str, f: def (builtins.str) -> builtins.str))
LambdaExpr(9) : def (builtins.int) -> builtins.int
NameExpr(9) : builtins.int

[case testExportOverloadArgTypeNested]
## LambdaExpr
from typing import overload, Callable
@overload
def f(x: int, f: Callable[[int], int]) -> int: ...
@overload
def f(x: str, f: Callable[[str], str]) -> str: ...
def f(x): ...
f(
    f(1, lambda y: y),
    lambda x: x)
f(
    f('x', lambda y: y),
    lambda x: x)
[builtins fixtures/list.pyi]
[out]
LambdaExpr(9) : def (builtins.int) -> builtins.int
LambdaExpr(10) : def (builtins.int) -> builtins.int
LambdaExpr(12) : def (builtins.str) -> builtins.str
LambdaExpr(13) : def (builtins.str) -> builtins.str

-- TODO
--
-- test expressions
--   list literal
--   tuple literal
--   unary minus
--   indexing
--   super expression
--   more complex lambda (multiple arguments etc.)
--   list comprehension
--   generator expression
-- other things
--   type inference
--   default argument value
--   for loop variable
--   exception variable
--   varargs
-- generics
--   explicit types
-- type of 'None' (currently stripped, but sometimes we may want to dump it)