error: impl for `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:11:35
   |
11 | impl<K: Hash + Eq, V> Foo<i8> for HashMap<K, V> {
   |                                   ^^^^^^^^^^^^^
   |
   = note: `-D implicit-hasher` implied by `-D warnings`
help: consider adding a type parameter
   |
11 | impl<K: Hash + Eq, V, S: ::std::hash::BuildHasher + Default> Foo<i8> for HashMap<K, V, S> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
17 |         (HashMap::default(), HashMap::with_capacity_and_hasher(10, Default::default()))
   |          ^^^^^^^^^^^^^^^^^^

error: impl for `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:20:36
   |
20 | impl<K: Hash + Eq, V> Foo<i8> for (HashMap<K, V>,) {
   |                                    ^^^^^^^^^^^^^
   |
help: consider adding a type parameter
   |
20 | impl<K: Hash + Eq, V, S: ::std::hash::BuildHasher + Default> Foo<i8> for (HashMap<K, V, S>,) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
22 |         ((HashMap::default(),), (HashMap::with_capacity_and_hasher(10, Default::default()),))
   |           ^^^^^^^^^^^^^^^^^^

error: impl for `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:25:19
   |
25 | impl Foo<i16> for HashMap<String, String> {
   |                   ^^^^^^^^^^^^^^^^^^^^^^^
   |
help: consider adding a type parameter
   |
25 | impl<S: ::std::hash::BuildHasher + Default> Foo<i16> for HashMap<String, String, S> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
27 |         (HashMap::default(), HashMap::with_capacity_and_hasher(10, Default::default()))
   |          ^^^^^^^^^^^^^^^^^^

error: impl for `HashSet` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:43:32
   |
43 | impl<T: Hash + Eq> Foo<i8> for HashSet<T> {
   |                                ^^^^^^^^^^
   |
help: consider adding a type parameter
   |
43 | impl<T: Hash + Eq, S: ::std::hash::BuildHasher + Default> Foo<i8> for HashSet<T, S> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
45 |         (HashSet::default(), HashSet::with_capacity_and_hasher(10, Default::default()))
   |          ^^^^^^^^^^^^^^^^^^

error: impl for `HashSet` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:48:19
   |
48 | impl Foo<i16> for HashSet<String> {
   |                   ^^^^^^^^^^^^^^^
   |
help: consider adding a type parameter
   |
48 | impl<S: ::std::hash::BuildHasher + Default> Foo<i16> for HashSet<String, S> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
50 |         (HashSet::default(), HashSet::with_capacity_and_hasher(10, Default::default()))
   |          ^^^^^^^^^^^^^^^^^^

error: parameter of type `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:65:23
   |
65 | pub fn foo(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {
   |                       ^^^^^^^^^^^^^^^^^
   |
help: consider adding a type parameter
   |
65 | pub fn foo<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32, S>, _set: &mut HashSet<i32>) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: parameter of type `HashSet` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:65:53
   |
65 | pub fn foo(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {
   |                                                     ^^^^^^^^^^^^
   |
help: consider adding a type parameter
   |
65 | pub fn foo<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32, S>) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: impl for `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:70:43
   |
70 |         impl<K: Hash + Eq, V> Foo<u8> for HashMap<K, V> {
   |                                           ^^^^^^^^^^^^^
...
83 | gen!(impl);
   | ----------- in this macro invocation
   |
help: consider adding a type parameter
   |
70 |         impl<K: Hash + Eq, V, S: ::std::hash::BuildHasher + Default> Foo<u8> for HashMap<K, V, S> {
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: ...and use generic constructor
   |
72 |                 (HashMap::default(), HashMap::with_capacity_and_hasher(10, Default::default()))
   |                  ^^^^^^^^^^^^^^^^^^

error: parameter of type `HashMap` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:78:33
   |
78 |         pub fn $name(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {
   |                                 ^^^^^^^^^^^^^^^^^
...
84 | gen!(fn bar);
   | ------------- in this macro invocation
   |
help: consider adding a type parameter
   |
78 |         pub fn $name<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32, S>, _set: &mut HashSet<i32>) {
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: parameter of type `HashSet` should be generalized over different hashers
  --> $DIR/implicit_hasher.rs:78:63
   |
78 |         pub fn $name(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {
   |                                                               ^^^^^^^^^^^^
...
84 | gen!(fn bar);
   | ------------- in this macro invocation
   |
help: consider adding a type parameter
   |
78 |         pub fn $name<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32, S>) {
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^