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

// rustfmt-use_small_heuristics: Off
// Test chain formatting.

fn main() {
    let a = b.c.d.1.foo(|x| x + 1);

    bbbbbbbbbbbbbbbbbbb.ccccccccccccccccccccccccccccccccccccc.ddddddddddddddddddddddddddd();

    bbbbbbbbbbbbbbbbbbb
        .ccccccccccccccccccccccccccccccccccccc
        .ddddddddddddddddddddddddddd
        .eeeeeeee();

    let f = fooooooooooooooooooooooooooooooooooooooooooooooooooo
        .baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaar;

    // Test case where first chain element isn't a path, but is shorter than
    // the size of a tab.
    x().y(|| match cond() {
        true => (),
        false => (),
    });

    loong_func().quux(move || {
        if true {
            1
        } else {
            2
        }
    });

    some_fuuuuuuuuunction().method_call_a(aaaaa, bbbbb, |c| {
        let x = c;
        x
    });

    some_fuuuuuuuuunction()
        .method_call_a(aaaaa, bbbbb, |c| {
            let x = c;
            x
        })
        .method_call_b(aaaaa, bbbbb, |c| {
            let x = c;
            x
        });

    fffffffffffffffffffffffffffffffffff(a, {
        SCRIPT_TASK_ROOT.with(|root| {
            *root.borrow_mut() = Some(&script_task);
        });
    });

    let suuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuum =
        xxxxxxx.map(|x| x + 5).map(|x| x / 2).fold(0, |acc, x| acc + x);

    body.fold(Body::new(), |mut body, chunk| {
        body.extend(chunk);
        Ok(body)
    })
    .and_then(move |body| {
        let req = Request::from_parts(parts, body);
        f(req).map_err(|_| io::Error::new(io::ErrorKind::Other, ""))
    });

    aaaaaaaaaaaaaaaa
        .map(|x| {
            x += 1;
            x
        })
        .filter(some_mod::some_filter)
}

fn floaters() {
    let z = Foo {
        field1: val1,
        field2: val2,
    };

    let x = Foo {
        field1: val1,
        field2: val2,
    }
    .method_call()
    .method_call();

    let y = if cond {
        val1
    } else {
        val2
    }
    .method_call();

    {
        match x {
            PushParam => {
                // params are 1-indexed
                stack.push(
                    mparams[match cur.to_digit(10) {
                        Some(d) => d as usize - 1,
                        None => return Err("bad param number".to_owned()),
                    }]
                    .clone(),
                );
            }
        }
    }

    if cond {
        some();
    } else {
        none();
    }
    .bar()
    .baz();

    Foo {
        x: val,
    }
    .baz(|| {
        force();
        multiline();
    })
    .quux();

    Foo {
        y: i_am_multi_line,
        z: ok,
    }
    .baz(|| {
        force();
        multiline();
    })
    .quux();

    a + match x {
        true => "yay!",
        false => "boo!",
    }
    .bar()
}

fn is_replaced_content() -> bool {
    constellat.send(ConstellationMsg::ViewportConstrained(self.id, constraints)).unwrap();
}

fn issue587() {
    a.b::<()>(c);

    std::mem::transmute(dl.symbol::<()>("init").unwrap())
}

fn try_shorthand() {
    let x = expr?;
    let y = expr.kaas()?.test();
    let loooooooooooooooooooooooooooooooooooooooooong =
        does_this?.look?.good?.should_we_break?.after_the_first_question_mark?;
    let yyyy = expr?.another?.another?.another?.another?.another?.another?.another?.another?.test();
    let zzzz = expr?.another?.another?.another?.another?;
    let aaa = x??????????????????????????????????????????????????????????????????????????;

    let y = a
        .very
        .loooooooooooooooooooooooooooooooooooooong()
        .chain()
        .inside()
        .weeeeeeeeeeeeeee()?
        .test()
        .0
        .x;

    parameterized(f, substs, def_id, Ns::Value, &[], |tcx| tcx.lookup_item_type(def_id).generics)?;
    fooooooooooooooooooooooooooo()?
        .bar()?
        .baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaz()?;
}

fn issue_1004() {
    match *self {
        ty::ImplOrTraitItem::MethodTraitItem(ref i) => write!(f, "{:?}", i),
        ty::ImplOrTraitItem::ConstTraitItem(ref i) => write!(f, "{:?}", i),
        ty::ImplOrTraitItem::TypeTraitItem(ref i) => write!(f, "{:?}", i),
    }?;

    ty::tls::with(|tcx| {
        let tap = ty::Binder(TraitAndProjections(principal, projections));
        in_binder(f, tcx, &ty::Binder(""), Some(tap))
    })?;
}

fn issue1392() {
    test_method(
        r#"
        if foo {
            a();
        }
        else {
            b();
        }
        "#
        .trim(),
    );
}

// #2067
impl Settings {
    fn save(&self) -> Result<()> {
        let mut file = File::create(&settings_path)
            .chain_err(|| ErrorKind::WriteError(settings_path.clone()))?;
    }
}

fn issue2126() {
    {
        {
            {
                {
                    {
                        let x = self
                            .span_from(sub_span.expect("No span found for struct arant variant"));
                        self.sspanpan_from_span(
                            sub_span.expect("No span found for struct variant"),
                        );
                        let x = self.spanpan_from_span(
                            sub_span.expect("No span found for struct variant"),
                        )?;
                    }
                }
            }
        }
    }
}

// #2200
impl Foo {
    pub fn from_ast(diagnostic: &::errors::Handler, attrs: &[ast::Attribute]) -> Attributes {
        let other_attrs = attrs
            .iter()
            .filter_map(|attr| {
                attr.with_desugared_doc(|attr| {
                    if attr.check_name("doc") {
                        if let Some(mi) = attr.meta() {
                            if let Some(value) = mi.value_str() {
                                doc_strings.push(DocFragment::Include(
                                    line, attr.span, filename, contents,
                                ));
                            }
                        }
                    }
                })
            })
            .collect();
    }
}

// #2415
// Avoid orphan in chain
fn issue2415() {
    let base_url = (|| {
        // stuff

        Ok((|| {
            // stuff
            Some(value.to_string())
        })()
        .ok_or("")?)
    })()
    .unwrap_or_else(|_: Box<::std::error::Error>| String::from(""));
}

impl issue_2786 {
    fn thing(&self) {
        foo(|a| {
            println!("a");
            println!("b");
        })
        .bar(|c| {
            println!("a");
            println!("b");
        })
        .baz(|c| {
            println!("a");
            println!("b");
        })
    }
}

fn issue_2773() {
    let bar = Some(0);
    bar.or_else(|| {
        // do stuff
        None
    })
    .or_else(|| {
        // do other stuff
        None
    })
    .and_then(|val| {
        // do this stuff
        None
    });
}

fn issue_3034() {
    disallowed_headers.iter().any(|header| *header == name)
        || disallowed_header_prefixes.iter().any(|prefix| name.starts_with(prefix))
}