Rename new lints to iter_on_empty_collections and iter_on_single_items

CHANGELOG.md

@@ -3651,13 +3651,13 @@ Released 2018-09-13
 [`items_after_statements`]: https://rust-lang.github.io/rust-clippy/master/index.html#items_after_statements
 [`iter_cloned_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_cloned_collect
 [`iter_count`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_count
-[`iter_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_empty
 [`iter_next_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_loop
 [`iter_next_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_slice
 [`iter_not_returning_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_not_returning_iterator
 [`iter_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth
 [`iter_nth_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth_zero
-[`iter_once`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_once
+[`iter_on_empty_collections`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_on_empty_collections
+[`iter_on_single_items`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_on_single_items
 [`iter_overeager_cloned`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_overeager_cloned
 [`iter_skip_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_skip_next
 [`iter_with_drain`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_with_drain

clippy_lints/src/lib.register_lints.rs

@@ -312,11 +312,11 @@ store.register_lints(&[
     methods::ITERATOR_STEP_BY_ZERO,
     methods::ITER_CLONED_COLLECT,
     methods::ITER_COUNT,
-    methods::ITER_EMPTY,
     methods::ITER_NEXT_SLICE,
     methods::ITER_NTH,
     methods::ITER_NTH_ZERO,
-    methods::ITER_ONCE,
+    methods::ITER_ON_EMPTY_COLLECTIONS,
+    methods::ITER_ON_SINGLE_ITEMS,
     methods::ITER_OVEREAGER_CLONED,
     methods::ITER_SKIP_NEXT,
     methods::ITER_WITH_DRAIN,

clippy_lints/src/lib.register_nursery.rs

@@ -14,8 +14,8 @@ store.register_group(true, "clippy::nursery", Some("clippy_nursery"), vec![
     LintId::of(index_refutable_slice::INDEX_REFUTABLE_SLICE),
     LintId::of(let_if_seq::USELESS_LET_IF_SEQ),
     LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
-    LintId::of(methods::ITER_EMPTY),
-    LintId::of(methods::ITER_ONCE),
+    LintId::of(methods::ITER_ON_EMPTY_COLLECTIONS),
+    LintId::of(methods::ITER_ON_SINGLE_ITEMS),
     LintId::of(methods::ITER_WITH_DRAIN),
     LintId::of(missing_const_for_fn::MISSING_CONST_FOR_FN),
     LintId::of(mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL),

clippy_lints/src/methods/iter_on_single_or_empty_collections.rs

@@ -7,7 +7,7 @@ use rustc_hir::LangItem::{OptionNone, OptionSome};
 use rustc_hir::{Expr, ExprKind, Node};
 use rustc_lint::LateContext;
 
-use super::{ITER_EMPTY, ITER_ONCE};
+use super::{ITER_ON_EMPTY_COLLECTIONS, ITER_ON_SINGLE_ITEMS};
 
 enum IterType {
     Iter,
@@ -82,7 +82,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>, method_name:
         );
         span_lint_and_sugg(
             cx,
-            ITER_ONCE,
+            ITER_ON_SINGLE_ITEMS,
             expr.span,
             &format!("`{method_name}` call on a collection with only one item"),
             "try",
@@ -92,7 +92,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>, method_name:
     } else {
         span_lint_and_sugg(
             cx,
-            ITER_EMPTY,
+            ITER_ON_EMPTY_COLLECTIONS,
             expr.span,
             &format!("`{method_name}` call on an empty collection"),
             "try",

clippy_lints/src/methods/mod.rs

@@ -33,7 +33,7 @@ mod iter_count;
 mod iter_next_slice;
 mod iter_nth;
 mod iter_nth_zero;
-mod iter_once_empty;
+mod iter_on_single_or_empty_collections;
 mod iter_overeager_cloned;
 mod iter_skip_next;
 mod iter_with_drain;
@@ -2331,7 +2331,7 @@ declare_clippy_lint! {
     ///
     /// The type of the resulting iterator might become incompatible with its usage
     #[clippy::version = "1.64.0"]
-    pub ITER_ONCE,
+    pub ITER_ON_SINGLE_ITEMS,
     nursery,
     "Iterator for array of length 1"
 }
@@ -2363,7 +2363,7 @@ declare_clippy_lint! {
     ///
     /// The type of the resulting iterator might become incompatible with its usage
     #[clippy::version = "1.64.0"]
-    pub ITER_EMPTY,
+    pub ITER_ON_EMPTY_COLLECTIONS,
     nursery,
     "Iterator for empty array"
 }
@@ -2470,8 +2470,8 @@ impl_lint_pass!(Methods => [
     NEEDLESS_OPTION_TAKE,
     NO_EFFECT_REPLACE,
     OBFUSCATED_IF_ELSE,
-    ITER_ONCE,
-    ITER_EMPTY
+    ITER_ON_SINGLE_ITEMS,
+    ITER_ON_EMPTY_COLLECTIONS
 ]);
 
 /// Extracts a method call name, args, and `Span` of the method name.
@@ -2774,7 +2774,9 @@ impl Methods {
                 ("is_digit", [radix]) => is_digit_ascii_radix::check(cx, expr, recv, radix, self.msrv),
                 ("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
                 ("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
-                ("iter" | "iter_mut" | "into_iter", []) => iter_once_empty::check(cx, expr, name, recv),
+                ("iter" | "iter_mut" | "into_iter", []) => {
+                    iter_on_single_or_empty_collections::check(cx, expr, name, recv);
+                },
                 ("join", [join_arg]) => {
                     if let Some(("collect", _, span)) = method_call(recv) {
                         unnecessary_join::check(cx, expr, recv, join_arg, span);

tests/ui/iter_on_empty_collections.fixed

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::iter_empty)]
+#![warn(clippy::iter_on_empty_collections)]
 #![allow(clippy::iter_next_slice, clippy::redundant_clone)]
 
 fn array() {

tests/ui/iter_on_empty_collections.rs

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::iter_empty)]
+#![warn(clippy::iter_on_empty_collections)]
 #![allow(clippy::iter_next_slice, clippy::redundant_clone)]
 
 fn array() {

tests/ui/iter_on_empty_collections.stderr

@@ -1,37 +1,37 @@
 error: `into_iter` call on an empty collection
-  --> $DIR/iter_empty.rs:6:16
+  --> $DIR/iter_on_empty_collections.rs:6:16
    |
 LL |     assert_eq!([].into_iter().next(), Option::<i32>::None);
    |                ^^^^^^^^^^^^^^ help: try: `std::iter::empty()`
    |
-   = note: `-D clippy::iter-empty` implied by `-D warnings`
+   = note: `-D clippy::iter-on-empty-collections` implied by `-D warnings`
 
 error: `iter_mut` call on an empty collection
-  --> $DIR/iter_empty.rs:7:16
+  --> $DIR/iter_on_empty_collections.rs:7:16
    |
 LL |     assert_eq!([].iter_mut().next(), Option::<&mut i32>::None);
    |                ^^^^^^^^^^^^^ help: try: `std::iter::empty()`
 
 error: `iter` call on an empty collection
-  --> $DIR/iter_empty.rs:8:16
+  --> $DIR/iter_on_empty_collections.rs:8:16
    |
 LL |     assert_eq!([].iter().next(), Option::<&i32>::None);
    |                ^^^^^^^^^ help: try: `std::iter::empty()`
 
 error: `into_iter` call on an empty collection
-  --> $DIR/iter_empty.rs:9:16
+  --> $DIR/iter_on_empty_collections.rs:9:16
    |
 LL |     assert_eq!(None.into_iter().next(), Option::<i32>::None);
    |                ^^^^^^^^^^^^^^^^ help: try: `std::iter::empty()`
 
 error: `iter_mut` call on an empty collection
-  --> $DIR/iter_empty.rs:10:16
+  --> $DIR/iter_on_empty_collections.rs:10:16
    |
 LL |     assert_eq!(None.iter_mut().next(), Option::<&mut i32>::None);
    |                ^^^^^^^^^^^^^^^ help: try: `std::iter::empty()`
 
 error: `iter` call on an empty collection
-  --> $DIR/iter_empty.rs:11:16
+  --> $DIR/iter_on_empty_collections.rs:11:16
    |
 LL |     assert_eq!(None.iter().next(), Option::<&i32>::None);
    |                ^^^^^^^^^^^ help: try: `std::iter::empty()`

tests/ui/iter_on_single_items.fixed

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::iter_once)]
+#![warn(clippy::iter_on_single_items)]
 #![allow(clippy::iter_next_slice, clippy::redundant_clone)]
 
 fn array() {

tests/ui/iter_on_single_items.rs

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::iter_once)]
+#![warn(clippy::iter_on_single_items)]
 #![allow(clippy::iter_next_slice, clippy::redundant_clone)]
 
 fn array() {

tests/ui/iter_on_single_items.stderr

@@ -1,37 +1,37 @@
 error: `into_iter` call on a collection with only one item
-  --> $DIR/iter_once.rs:6:16
+  --> $DIR/iter_on_single_items.rs:6:16
    |
 LL |     assert_eq!([123].into_iter().next(), Some(123));
    |                ^^^^^^^^^^^^^^^^^ help: try: `std::iter::once(123)`
    |
-   = note: `-D clippy::iter-once` implied by `-D warnings`
+   = note: `-D clippy::iter-on-single-items` implied by `-D warnings`
 
 error: `iter_mut` call on a collection with only one item
-  --> $DIR/iter_once.rs:7:16
+  --> $DIR/iter_on_single_items.rs:7:16
    |
 LL |     assert_eq!([123].iter_mut().next(), Some(&mut 123));
    |                ^^^^^^^^^^^^^^^^ help: try: `std::iter::once(&mut 123)`
 
 error: `iter` call on a collection with only one item
-  --> $DIR/iter_once.rs:8:16
+  --> $DIR/iter_on_single_items.rs:8:16
    |
 LL |     assert_eq!([123].iter().next(), Some(&123));
    |                ^^^^^^^^^^^^ help: try: `std::iter::once(&123)`
 
 error: `into_iter` call on a collection with only one item
-  --> $DIR/iter_once.rs:9:16
+  --> $DIR/iter_on_single_items.rs:9:16
    |
 LL |     assert_eq!(Some(123).into_iter().next(), Some(123));
    |                ^^^^^^^^^^^^^^^^^^^^^ help: try: `std::iter::once(123)`
 
 error: `iter_mut` call on a collection with only one item
-  --> $DIR/iter_once.rs:10:16
+  --> $DIR/iter_on_single_items.rs:10:16
    |
 LL |     assert_eq!(Some(123).iter_mut().next(), Some(&mut 123));
    |                ^^^^^^^^^^^^^^^^^^^^ help: try: `std::iter::once(&mut 123)`
 
 error: `iter` call on a collection with only one item
-  --> $DIR/iter_once.rs:11:16
+  --> $DIR/iter_on_single_items.rs:11:16
    |
 LL |     assert_eq!(Some(123).iter().next(), Some(&123));
    |                ^^^^^^^^^^^^^^^^ help: try: `std::iter::once(&123)`