Suppress broken semicolon_if_nothing_returned lint

https://github.com/rust-lang/rust-clippy/issues/7768

    error: consider adding a `;` to the last statement for consistent formatting
       --> serde/src/de/impls.rs:849:1
        |
    849 | / seq_impl!(
    850 | |     BinaryHeap<T: Ord>,
    851 | |     seq,
    852 | |     BinaryHeap::clear,
    ...   |
    855 | |     BinaryHeap::push
    856 | | );
        | |__^
        |
    note: the lint level is defined here
       --> serde/src/lib.rs:97:52
        |
    97  | #![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]
        |                                                    ^^^^^^^^^^^^^^^
        = note: `#[deny(clippy::semicolon_if_nothing_returned)]` implied by `#[deny(clippy::pedantic)]`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
        |
    849 + seq_impl!(
    850 +     BinaryHeap<T: Ord>,
    851 +     seq,
    852 +     BinaryHeap::clear,
    853 +     BinaryHeap::with_capacity(size_hint::cautious(seq.size_hint())),
    854 +     BinaryHeap::reserve,
      ...

    error: consider adding a `;` to the last statement for consistent formatting
       --> serde/src/de/impls.rs:859:1
        |
    859 | / seq_impl!(
    860 | |     BTreeSet<T: Eq + Ord>,
    861 | |     seq,
    862 | |     BTreeSet::clear,
    ...   |
    865 | |     BTreeSet::insert
    866 | | );
        | |__^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
        |
    859 + seq_impl!(
    860 +     BTreeSet<T: Eq + Ord>,
    861 +     seq,
    862 +     BTreeSet::clear,
    863 +     BTreeSet::new(),
    864 +     nop_reserve,
      ...

    error: consider adding a `;` to the last statement for consistent formatting
       --> serde/src/de/impls.rs:869:1
        |
    869 | / seq_impl!(
    870 | |     LinkedList<T>,
    871 | |     seq,
    872 | |     LinkedList::clear,
    ...   |
    875 | |     LinkedList::push_back
    876 | | );
        | |__^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
        |
    869 + seq_impl!(
    870 +     LinkedList<T>,
    871 +     seq,
    872 +     LinkedList::clear,
    873 +     LinkedList::new(),
    874 +     nop_reserve,
      ...

    error: consider adding a `;` to the last statement for consistent formatting
       --> serde/src/de/impls.rs:879:1
        |
    879 | / seq_impl!(
    880 | |     HashSet<T: Eq + Hash, S: BuildHasher + Default>,
    881 | |     seq,
    882 | |     HashSet::clear,
    883 | |     HashSet::with_capacity_and_hasher(size_hint::cautious(seq.size_hint()), S::default()),
    884 | |     HashSet::reserve,
    885 | |     HashSet::insert);
        | |_____________________^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
        |
    879 + seq_impl!(
    880 +     HashSet<T: Eq + Hash, S: BuildHasher + Default>,
    881 +     seq,
    882 +     HashSet::clear,
    883 +     HashSet::with_capacity_and_hasher(size_hint::cautious(seq.size_hint()), S::default()),
    884 +     HashSet::reserve,
      ...

    error: consider adding a `;` to the last statement for consistent formatting
       --> serde/src/de/impls.rs:888:1
        |
    888 | / seq_impl!(
    889 | |     VecDeque<T>,
    890 | |     seq,
    891 | |     VecDeque::clear,
    ...   |
    894 | |     VecDeque::push_back
    895 | | );
        | |__^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
        |
    888 + seq_impl!(
    889 +     VecDeque<T>,
    890 +     seq,
    891 +     VecDeque::clear,
    892 +     VecDeque::with_capacity(size_hint::cautious(seq.size_hint())),
    893 +     VecDeque::reserve,
      ...

    error: consider adding a `;` to the last statement for consistent formatting
        --> serde/src/de/impls.rs:1300:1
         |
    1300 | / map_impl!(
    1301 | |     BTreeMap<K: Ord, V>,
    1302 | |     map,
    1303 | |     BTreeMap::new());
         | |_____________________^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
         |
    1300 + map_impl!(
    1301 +     BTreeMap<K: Ord, V>,
    1302 +     map,
    1303 +     BTreeMap::new());;
         |

    error: consider adding a `;` to the last statement for consistent formatting
        --> serde/src/de/impls.rs:1306:1
         |
    1306 | / map_impl!(
    1307 | |     HashMap<K: Eq + Hash, V, S: BuildHasher + Default>,
    1308 | |     map,
    1309 | |     HashMap::with_capacity_and_hasher(size_hint::cautious(map.size_hint()), S::default()));
         | |___________________________________________________________________________________________^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
    help: add a `;` here
         |
    1306 + map_impl!(
    1307 +     HashMap<K: Eq + Hash, V, S: BuildHasher + Default>,
    1308 +     map,
    1309 +     HashMap::with_capacity_and_hasher(size_hint::cautious(map.size_hint()), S::default()));;
         |

serde/src/lib.rs

@@ -101,6 +101,8 @@
     allow(
         // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
         unnested_or_patterns,
+        // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7768
+        semicolon_if_nothing_returned,
         // not available in our oldest supported compiler
         checked_conversions,
         empty_enum,