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ruff/crates/ty_python_semantic/resources/mdtest/narrow/conditionals/nested.md

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Narrowing for nested conditionals

Multiple negative contributions

def _(x: int):
    if x != 1:
        if x != 2:
            if x != 3:
                reveal_type(x)  # revealed: int & ~Literal[1] & ~Literal[2] & ~Literal[3]

Multiple negative contributions with simplification

def _(flag1: bool, flag2: bool):
    x = 1 if flag1 else 2 if flag2 else 3

    if x != 1:
        reveal_type(x)  # revealed: Literal[2, 3]
        if x != 2:
            reveal_type(x)  # revealed: Literal[3]

elif-else blocks

def _(flag1: bool, flag2: bool):
    x = 1 if flag1 else 2 if flag2 else 3

    if x != 1:
        reveal_type(x)  # revealed: Literal[2, 3]
        if x == 2:
            reveal_type(x)  # revealed: Literal[2]
        elif x == 3:
            reveal_type(x)  # revealed: Literal[3]
        else:
            reveal_type(x)  # revealed: Never

    elif x != 2:
        reveal_type(x)  # revealed: Literal[1]
    else:
        reveal_type(x)  # revealed: Never