src/tools/rustfmt/tests/target/closure.rs

// rustfmt-normalize_comments: true
// Closures

fn main() {
    let square = (|i: i32| i * i);

    let commented = |// first
                     a, // argument
                     // second
                     b: WithType, // argument
                     // ignored
                     _| {
        (
            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
            bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
        )
    };

    let block_body = move |xxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
                           ref yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy| {
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
    };

    let loooooooooooooong_name = |field| {
        // format comments.
        if field.node.attrs.len() > 0 {
            field.node.attrs[0].span.lo()
        } else {
            field.span.lo()
        }
    };

    let unblock_me = |trivial| closure();

    let empty = |arg| {};

    let simple = |arg| {
        // comment formatting
        foo(arg)
    };

    let test = || {
        do_something();
        do_something_else();
    };

    let arg_test =
        |big_argument_name, test123| looooooooooooooooooong_function_naaaaaaaaaaaaaaaaame();

    let arg_test =
        |big_argument_name, test123| looooooooooooooooooong_function_naaaaaaaaaaaaaaaaame();

    let simple_closure = move || -> () {};

    let closure = |input: Ty| -> Option<String> { foo() };

    let closure_with_return_type =
        |aaaaaaaaaaaaaaaaaaaaaaarg1, aaaaaaaaaaaaaaaaaaaaaaarg2| -> Strong { "sup".to_owned() };

    |arg1, arg2, _, _, arg3, arg4| {
        let temp = arg4 + arg3;
        arg2 * arg1 - temp
    };

    let block_body_with_comment = args.iter().map(|a| {
        // Emitting only dep-info is possible only for final crate type, as
        // as others may emit required metadata for dependent crate types
        if a.starts_with("--emit") && is_final_crate_type && !self.workspace_mode {
            "--emit=dep-info"
        } else {
            a
        }
    });

    for<> || -> () {};
    for<> || -> () {};
    for<> || -> () {};

    for<'a, 'b, 'c> |_: &'a (), _: &'b (), _: &'c ()| -> () {};
}

fn issue311() {
    let func = |x| println!("{}", x);

    (func)(0.0);
}

fn issue863() {
    let closure = |x| match x {
        0 => true,
        _ => false,
    } == true;
}

fn issue934() {
    let hash: &Fn(&&Block) -> u64 = &|block| -> u64 {
        let mut h = SpanlessHash::new(cx);
        h.hash_block(block);
        h.finish()
    };

    let hash: &Fn(&&Block) -> u64 = &|block| -> u64 {
        let mut h = SpanlessHash::new(cx);
        h.hash_block(block);
        h.finish();
    };
}

impl<'a, 'tcx: 'a> SpanlessEq<'a, 'tcx> {
    pub fn eq_expr(&self, left: &Expr, right: &Expr) -> bool {
        match (&left.node, &right.node) {
            (&ExprBinary(l_op, ref ll, ref lr), &ExprBinary(r_op, ref rl, ref rr)) => {
                l_op.node == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
                    || swap_binop(l_op.node, ll, lr).map_or(false, |(l_op, ll, lr)| {
                        l_op == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
                    })
            }
        }
    }
}

fn foo() {
    lifetimes_iter___map(|lasdfasfd| {
        let hi = if l.bounds.is_empty() {
            l.lifetime.span.hi()
        };
    });
}

fn issue1405() {
    open_raw_fd(fd, b'r').and_then(|file| {
        Capture::new_raw(None, |_, err| unsafe { raw::pcap_fopen_offline(file, err) })
    });
}

fn issue1466() {
    let vertex_buffer = frame.scope(|ctx| {
        let buffer = ctx.create_host_visible_buffer::<VertexBuffer<Vertex>>(&vertices);
        ctx.create_device_local_buffer(buffer)
    });
}

fn issue470() {
    {
        {
            {
                let explicit_arg_decls =
                    explicit_arguments
                        .into_iter()
                        .enumerate()
                        .map(|(index, (ty, pattern))| {
                            let lvalue = Lvalue::Arg(index as u32);
                            block = this.pattern(
                                block,
                                argument_extent,
                                hair::PatternRef::Hair(pattern),
                                &lvalue,
                            );
                            ArgDecl { ty: ty }
                        });
            }
        }
    }
}

// #1509
impl Foo {
    pub fn bar(&self) {
        Some(SomeType {
            push_closure_out_to_100_chars: iter(otherwise_it_works_ok.into_iter().map(|f| Ok(f))),
        })
    }
}

fn issue1329() {
    aaaaaaaaaaaaaaaa
        .map(|x| {
            x += 1;
            x
        })
        .filter
}

fn issue325() {
    let f =
        || unsafe { xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx };
}

fn issue1697() {
    Test.func_a(
        A_VERY_LONG_CONST_VARIABLE_NAME,
        move |arg1, arg2, arg3, arg4| arg1 + arg2 + arg3 + arg4,
    )
}

fn issue1694() {
    foooooo(
        |_referencefffffffff: _, _target_reference: _, _oid: _, _target_oid: _| {
            format!("refs/pull/{}/merge", pr_id)
        },
    )
}

fn issue1713() {
    rayon::join(
        || recurse(left, is_less, pred, limit),
        || recurse(right, is_less, Some(pivot), limit),
    );

    rayon::join(
        1,
        || recurse(left, is_less, pred, limit),
        2,
        || recurse(right, is_less, Some(pivot), limit),
    );
}

fn issue2063() {
    |ctx: Ctx<(String, String)>| -> io::Result<Response> {
        Ok(Response::new().with_body(ctx.params.0))
    }
}

fn issue1524() {
    let f = |x| x;
    let f = |x| x;
    let f = |x| x;
    let f = |x| x;
    let f = |x| x;
}

fn issue2171() {
    foo(|| unsafe {
        if PERIPHERALS {
            loop {}
        } else {
            PERIPHERALS = true;
        }
    })
}

fn issue2207() {
    a.map(|_| {
        unsafe { a_very_very_very_very_very_very_very_long_function_name_or_anything_else() }
            .to_string()
    })
}

fn issue2262() {
    result
        .init(&mut result.slave.borrow_mut(), &mut (result.strategy)())
        .map_err(|factory| Error {
            factory,
            slave: None,
        })?;
}