Downgrade implicit_hasher to pedantic

clippy_lints/src/lib.rs

@@ -1135,6 +1135,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&types::CAST_POSSIBLE_WRAP),
         LintId::of(&types::CAST_PRECISION_LOSS),
         LintId::of(&types::CAST_SIGN_LOSS),
+        LintId::of(&types::IMPLICIT_HASHER),
         LintId::of(&types::INVALID_UPCAST_COMPARISONS),
         LintId::of(&types::LET_UNIT_VALUE),
         LintId::of(&types::LINKEDLIST),
@@ -1384,7 +1385,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&types::CHAR_LIT_AS_U8),
         LintId::of(&types::FN_TO_NUMERIC_CAST),
         LintId::of(&types::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
-        LintId::of(&types::IMPLICIT_HASHER),
         LintId::of(&types::REDUNDANT_ALLOCATION),
         LintId::of(&types::TYPE_COMPLEXITY),
         LintId::of(&types::UNIT_ARG),
@@ -1495,7 +1495,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&try_err::TRY_ERR),
         LintId::of(&types::FN_TO_NUMERIC_CAST),
         LintId::of(&types::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
-        LintId::of(&types::IMPLICIT_HASHER),
         LintId::of(&unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
         LintId::of(&write::PRINTLN_EMPTY_STRING),
         LintId::of(&write::PRINT_LITERAL),

clippy_lints/src/types.rs

@@ -2170,7 +2170,7 @@ declare_clippy_lint! {
     /// pub fn foo<S: BuildHasher>(map: &mut HashMap<i32, i32, S>) { }
     /// ```
     pub IMPLICIT_HASHER,
-    style,
+    pedantic,
     "missing generalization over different hashers"
 }
 

src/lintlist/mod.rs

@@ -747,7 +747,7 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
     },
     Lint {
         name: "implicit_hasher",
-        group: "style",
+        group: "pedantic",
         desc: "missing generalization over different hashers",
         deprecation: None,
         module: "types",

tests/ui/crashes/ice-3717.rs

@@ -1,3 +1,5 @@
+#![deny(clippy::implicit_hasher)]
+
 use std::collections::HashSet;
 
 fn main() {}

tests/ui/crashes/ice-3717.stderr

@@ -1,10 +1,14 @@
 error: parameter of type `HashSet` should be generalized over different hashers
-  --> $DIR/ice-3717.rs:5:21
+  --> $DIR/ice-3717.rs:7:21
    |
 LL | pub fn ice_3717(_: &HashSet<usize>) {
    |                     ^^^^^^^^^^^^^^
    |
-   = note: `-D clippy::implicit-hasher` implied by `-D warnings`
+note: the lint level is defined here
+  --> $DIR/ice-3717.rs:1:9
+   |
+LL | #![deny(clippy::implicit_hasher)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^
 help: consider adding a type parameter
    |
 LL | pub fn ice_3717<S: ::std::hash::BuildHasher + Default>(_: &HashSet<usize, S>) {

tests/ui/implicit_hasher.rs

@@ -1,4 +1,5 @@
 // aux-build:implicit_hasher_macros.rs
+#![deny(clippy::implicit_hasher)]
 #![allow(unused)]
 
 #[macro_use]

tests/ui/implicit_hasher.stderr

@@ -1,10 +1,14 @@
 error: impl for `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:15:35
+  --> $DIR/implicit_hasher.rs:16:35
    |
 LL | impl<K: Hash + Eq, V> Foo<i8> for HashMap<K, V> {
    |                                   ^^^^^^^^^^^^^
    |
-   = note: `-D clippy::implicit-hasher` implied by `-D warnings`
+note: the lint level is defined here
+  --> $DIR/implicit_hasher.rs:2:9
+   |
+LL | #![deny(clippy::implicit_hasher)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^
 help: consider adding a type parameter
    |
 LL | impl<K: Hash + Eq, V, S: ::std::hash::BuildHasher + Default> Foo<i8> for HashMap<K, V, S> {
@@ -15,7 +19,7 @@ LL |         (HashMap::default(), HashMap::with_capacity_and_hasher(10, Default:
    |          ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: impl for `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:24:36
+  --> $DIR/implicit_hasher.rs:25:36
    |
 LL | impl<K: Hash + Eq, V> Foo<i8> for (HashMap<K, V>,) {
    |                                    ^^^^^^^^^^^^^
@@ -30,7 +34,7 @@ LL |         ((HashMap::default(),), (HashMap::with_capacity_and_hasher(10, Defa
    |           ^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: impl for `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:29:19
+  --> $DIR/implicit_hasher.rs:30:19
    |
 LL | impl Foo<i16> for HashMap<String, String> {
    |                   ^^^^^^^^^^^^^^^^^^^^^^^
@@ -45,7 +49,7 @@ LL |         (HashMap::default(), HashMap::with_capacity_and_hasher(10, Default:
    |          ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: impl for `HashSet` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:46:32
+  --> $DIR/implicit_hasher.rs:47:32
    |
 LL | impl<T: Hash + Eq> Foo<i8> for HashSet<T> {
    |                                ^^^^^^^^^^
@@ -60,7 +64,7 @@ LL |         (HashSet::default(), HashSet::with_capacity_and_hasher(10, Default:
    |          ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: impl for `HashSet` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:51:19
+  --> $DIR/implicit_hasher.rs:52:19
    |
 LL | impl Foo<i16> for HashSet<String> {
    |                   ^^^^^^^^^^^^^^^
@@ -75,7 +79,7 @@ LL |         (HashSet::default(), HashSet::with_capacity_and_hasher(10, Default:
    |          ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: parameter of type `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:68:23
+  --> $DIR/implicit_hasher.rs:69:23
    |
 LL | pub fn foo(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {}
    |                       ^^^^^^^^^^^^^^^^^
@@ -86,7 +90,7 @@ LL | pub fn foo<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32, S>, _s
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^
 
 error: parameter of type `HashSet` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:68:53
+  --> $DIR/implicit_hasher.rs:69:53
    |
 LL | pub fn foo(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {}
    |                                                     ^^^^^^^^^^^^
@@ -97,7 +101,7 @@ LL | pub fn foo<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i32>, _set:
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                          ^^^^^^^^^^^^^^^
 
 error: impl for `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:72:43
+  --> $DIR/implicit_hasher.rs:73:43
    |
 LL |         impl<K: Hash + Eq, V> Foo<u8> for HashMap<K, V> {
    |                                           ^^^^^^^^^^^^^
@@ -116,7 +120,7 @@ LL |                 (HashMap::default(), HashMap::with_capacity_and_hasher(10,
    |                  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: parameter of type `HashMap` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:80:33
+  --> $DIR/implicit_hasher.rs:81:33
    |
 LL |         pub fn $name(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {}
    |                                 ^^^^^^^^^^^^^^^^^
@@ -131,7 +135,7 @@ LL |         pub fn $name<S: ::std::hash::BuildHasher>(_map: &mut HashMap<i32, i
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^
 
 error: parameter of type `HashSet` should be generalized over different hashers
-  --> $DIR/implicit_hasher.rs:80:63
+  --> $DIR/implicit_hasher.rs:81:63
    |
 LL |         pub fn $name(_map: &mut HashMap<i32, i32>, _set: &mut HashSet<i32>) {}
    |                                                               ^^^^^^^^^^^^

tests/ui/mut_key.rs

@@ -1,5 +1,3 @@
-#![allow(clippy::implicit_hasher)]
-
 use std::collections::{HashMap, HashSet};
 use std::hash::{Hash, Hasher};
 use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};

tests/ui/mut_key.stderr

@@ -1,5 +1,5 @@
 error: mutable key type
-  --> $DIR/mut_key.rs:29:32
+  --> $DIR/mut_key.rs:27:32
    |
 LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,19 +7,19 @@ LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> Hash
    = note: `#[deny(clippy::mutable_key_type)]` on by default
 
 error: mutable key type
-  --> $DIR/mut_key.rs:29:72
+  --> $DIR/mut_key.rs:27:72
    |
 LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
    |                                                                        ^^^^^^^^^^^^
 
 error: mutable key type
-  --> $DIR/mut_key.rs:30:5
+  --> $DIR/mut_key.rs:28:5
    |
 LL |     let _other: HashMap<Key, bool> = HashMap::new();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: mutable key type
-  --> $DIR/mut_key.rs:49:22
+  --> $DIR/mut_key.rs:47:22
    |
 LL | fn tuples_bad<U>(_m: &mut HashMap<(Key, U), bool>) {}
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^