//@no-rustfix

#![warn(clippy::unconditional_recursion)]

enum Foo {
    A,
    B,
}

impl PartialEq for Foo {
    fn ne(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self != other
    }
    fn eq(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self == other
    }
}

enum Foo2 {
    A,
    B,
}

impl PartialEq for Foo2 {
    fn ne(&self, other: &Self) -> bool {
        self != &Foo2::B // no error here
    }
    fn eq(&self, other: &Self) -> bool {
        self == &Foo2::B // no error here
    }
}

enum Foo3 {
    A,
    B,
}

impl PartialEq for Foo3 {
    fn ne(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self.ne(other)
    }
    fn eq(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self.eq(other)
    }
}

enum Foo4 {
    A,
    B,
}

impl PartialEq for Foo4 {
    fn ne(&self, other: &Self) -> bool {
        self.eq(other) // no error
    }
    fn eq(&self, other: &Self) -> bool {
        self.ne(other) // no error
    }
}

enum Foo5 {
    A,
    B,
}

impl Foo5 {
    fn a(&self) -> bool {
        true
    }
}

impl PartialEq for Foo5 {
    fn ne(&self, other: &Self) -> bool {
        self.a() // no error
    }
    fn eq(&self, other: &Self) -> bool {
        self.a() // no error
    }
}

struct S;

// Check the order doesn't matter.
impl PartialEq for S {
    fn ne(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        other != self
    }
    fn eq(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        other == self
    }
}

struct S2;

// Check that if the same element is compared, it's also triggering the lint.
impl PartialEq for S2 {
    fn ne(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        other != other
    }
    fn eq(&self, other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        other == other
    }
}

struct S3;

impl PartialEq for S3 {
    fn ne(&self, _other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self != self
    }
    fn eq(&self, _other: &Self) -> bool {
        //~^ ERROR: function cannot return without recursing
        self == self
    }
}

fn main() {
    // test code goes here
}