[red-knot] Porting to new structure after remarks

crates/red_knot_python_semantic/resources/mdtest/assignment/annotations.md

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+# Assignment with annotations
+
+## Annotation only transparent to local inference
+
+```py
+x = 1
+x: int
+y = x
+
+reveal_type(y)  # revealed: Literal[1]
+```
+
+## Violates own annotation
+
+```py
+x: int = 'foo' # error: [invalid-assignment] "Object of type `Literal["foo"]` is not assignable to `int`"
+
+```
+
+## Violates previous annotation
+
+```py
+x: int
+x = 'foo'  # error: [invalid-assignment] "Object of type `Literal["foo"]` is not assignable to `int`"
+```

crates/red_knot_python_semantic/resources/mdtest/assignment/attributes.md

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+# Class attributes assignment
+
+## Union of attributes
+
+```py
+if flag:
+    class C:
+        x = 1
+else:
+    class C:
+        x = 2
+
+y = C.x
+reveal_type(y)  # revealed: Literal[1, 2]
+```

crates/red_knot_python_semantic/resources/mdtest/assignment/error_declaration.md

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+# Errors while declaring
+
+## Violates previous assignment
+
+```py
+x = 1
+x: str  # error: [invalid-declaration] "Cannot declare type `str` for inferred type `Literal[1]`"
+```
+
+## Incompatible declarations
+
+```py
+if flag:
+    x: str
+else:
+    x: int
+x = 1  # error: [conflicting-declarations] "Conflicting declared types for `x`: str, int"
+```
+
+## Partial declarations
+
+```py
+if flag:
+    x: int
+x = 1  # error: [conflicting-declarations] "Conflicting declared types for `x`: Unknown, int"
+```
+
+## Incompatible declarations with bad assignment
+
+```py
+if flag:
+    x: str
+else:
+    x: int
+
+# error: [conflicting-declarations]
+# error: [invalid-assignment]
+x = b'foo'
+```

crates/red_knot_python_semantic/resources/mdtest/assignment/multi_target.md

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+# Multi-target assignment
+
+## Basic
+
+```py
+x = y = 1
+reveal_type(x)  # revealed: Literal[1]
+reveal_type(y)  # revealed: Literal[1]
+```

crates/red_knot_python_semantic/resources/mdtest/assignment/unbound.md

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+# Unbound
+
+## Maybe unbound
+
+```py
+if flag:
+    y = 3
+x = y
+reveal_type(x)  # revealed: Unbound | Literal[3]
+```
+
+## Unbound
+
+```py
+x = foo; foo = 1
+reveal_type(x)  # revealed: Unbound
+```
+
+## Unbound class variable
+
+Class variables can reference global variables unless overridden within the class scope.
+
+```py
+x = 1
+class C:
+    y = x
+    if flag:
+        x = 2
+
+reveal_type(C.x) # revealed: Unbound | Literal[2]
+reveal_type(C.y) # revealed: Literal[1]
+```

crates/red_knot_python_semantic/resources/mdtest/assignment/walrus.md

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+# Walrus operator
+
+## Basic
+
+```py
+x = (y := 1) + 1
+reveal_type(x)  # revealed: Literal[2]
+reveal_type(y)  # revealed: Literal[1]
+```
+
+## Walrus self-addition
+
+```py
+x = 0
+(x := x + 1)
+reveal_type(x)  # revealed: Literal[1]
+```

crates/red_knot_python_semantic/resources/mdtest/binary/integers.md

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+## Binary operations on integers
+
+## Basic Arithmetic
+
+```py
+a = 2 + 1
+b = a - 4
+c = a * b
+d = c // 3
+e = c / 3
+f = 5 % 3
+
+reveal_type(a)  # revealed: Literal[3]
+reveal_type(b)  # revealed: Literal[-1]
+reveal_type(c)  # revealed: Literal[-3]
+reveal_type(d)  # revealed: Literal[-1]
+reveal_type(e)  # revealed: float
+reveal_type(f)  # revealed: Literal[2]
+```
+
+## Division by Zero
+
+```py
+# TODO: `a` should be `int` and `e` should be `float` once we support inference.
+a = 1 / 0  # error: "Cannot divide object of type `Literal[1]` by zero"
+b = 2 // 0  # error: "Cannot floor divide object of type `Literal[2]` by zero"
+c = 3 % 0  # error: "Cannot reduce object of type `Literal[3]` modulo zero"
+d = int() / 0  # error: "Cannot divide object of type `int` by zero"
+e = 1.0 / 0  # error: "Cannot divide object of type `float` by zero"
+
+reveal_type(a)  # revealed: float
+reveal_type(b)  # revealed: int
+reveal_type(c)  # revealed: int
+reveal_type(d)  # revealed: @Todo
+reveal_type(e)  # revealed: @Todo
+```