Refactor excessive_for_each

Author: Y-Nak

CHANGELOG.md

@@ -2056,7 +2056,6 @@ Released 2018-09-13
 [`eq_op`]: https://rust-lang.github.io/rust-clippy/master/index.html#eq_op
 [`erasing_op`]: https://rust-lang.github.io/rust-clippy/master/index.html#erasing_op
 [`eval_order_dependence`]: https://rust-lang.github.io/rust-clippy/master/index.html#eval_order_dependence
-[`excessive_for_each`]: https://rust-lang.github.io/rust-clippy/master/index.html#excessive_for_each
 [`excessive_precision`]: https://rust-lang.github.io/rust-clippy/master/index.html#excessive_precision
 [`exhaustive_enums`]: https://rust-lang.github.io/rust-clippy/master/index.html#exhaustive_enums
 [`exhaustive_structs`]: https://rust-lang.github.io/rust-clippy/master/index.html#exhaustive_structs
@@ -2234,6 +2233,7 @@ Released 2018-09-13
 [`needless_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_collect
 [`needless_continue`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
 [`needless_doctest_main`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_doctest_main
+[`needless_for_each`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_for_each
 [`needless_lifetimes`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
 [`needless_pass_by_value`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_value
 [`needless_question_mark`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_question_mark

clippy_lints/src/iter_for_each.rs

@@ -289,6 +289,7 @@ mod needless_bool;
 mod needless_borrow;
 mod needless_borrowed_ref;
 mod needless_continue;
+mod needless_for_each;
 mod needless_pass_by_value;
 mod needless_question_mark;
 mod needless_update;
@@ -774,7 +775,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &methods::CLONE_DOUBLE_REF,
         &methods::CLONE_ON_COPY,
         &methods::CLONE_ON_REF_PTR,
-        &methods::EXCESSIVE_FOR_EACH,
         &methods::EXPECT_FUN_CALL,
         &methods::EXPECT_USED,
         &methods::FILETYPE_IS_FILE,
@@ -861,6 +861,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &needless_borrow::NEEDLESS_BORROW,
         &needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE,
         &needless_continue::NEEDLESS_CONTINUE,
+        &needless_for_each::NEEDLESS_FOR_EACH,
         &needless_pass_by_value::NEEDLESS_PASS_BY_VALUE,
         &needless_question_mark::NEEDLESS_QUESTION_MARK,
         &needless_update::NEEDLESS_UPDATE,
@@ -1040,6 +1041,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(|| box ptr_eq::PtrEq);
     store.register_late_pass(|| box needless_bool::NeedlessBool);
     store.register_late_pass(|| box needless_bool::BoolComparison);
+    store.register_late_pass(|| box needless_for_each::NeedlessForEach);
     store.register_late_pass(|| box approx_const::ApproxConstant);
     store.register_late_pass(|| box misc::MiscLints);
     store.register_late_pass(|| box eta_reduction::EtaReduction);
@@ -1311,7 +1313,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&matches::WILDCARD_ENUM_MATCH_ARM),
         LintId::of(&mem_forget::MEM_FORGET),
         LintId::of(&methods::CLONE_ON_REF_PTR),
-        LintId::of(&methods::EXCESSIVE_FOR_EACH),
         LintId::of(&methods::EXPECT_USED),
         LintId::of(&methods::FILETYPE_IS_FILE),
         LintId::of(&methods::GET_UNWRAP),
@@ -1322,6 +1323,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS),
         LintId::of(&missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS),
         LintId::of(&modulo_arithmetic::MODULO_ARITHMETIC),
+        LintId::of(&needless_for_each::NEEDLESS_FOR_EACH),
         LintId::of(&panic_in_result_fn::PANIC_IN_RESULT_FN),
         LintId::of(&panic_unimplemented::PANIC),
         LintId::of(&panic_unimplemented::TODO),

clippy_lints/src/lib.rs

@@ -960,33 +960,6 @@ declare_clippy_lint! {
     "using `.skip(x).next()` on an iterator"
 }
 
-declare_clippy_lint! {
-    /// **What it does:** Checks for use of `.method(..).for_each(closure)` if the reciever of `.method(..)` doesn't
-    /// implement `Iterator` and the return type of `.method(..)` implements `Iterator`.
-    ///
-    /// **Why is this bad?** Excessive use of `for_each` reduces redability, using `for` loop is
-    /// clearer and more concise.
-    ///
-    /// **Known problems:** None.
-    ///
-    /// **Example:**
-    ///
-    /// ```rust
-    /// let v = vec![0, 1, 2];
-    /// v.iter().for_each(|elem| println!("{}", elem));
-    /// ```
-    /// Use instead:
-    /// ```rust
-    /// let v = vec![0, 1, 2];
-    /// for elem in v.iter() {
-    ///     println!("{}", elem);
-    /// }
-    /// ```
-    pub EXCESSIVE_FOR_EACH,
-    restriction,
-    "using `.iter().for_each(|x| {..})` when using `for` loop would work instead"
-}
-
 declare_clippy_lint! {
     /// **What it does:** Checks for use of `.get().unwrap()` (or
     /// `.get_mut().unwrap`) on a standard library type which implements `Index`
@@ -1674,7 +1647,6 @@ impl_lint_pass!(Methods => [
     ITER_NTH_ZERO,
     BYTES_NTH,
     ITER_SKIP_NEXT,
-    EXCESSIVE_FOR_EACH,
     GET_UNWRAP,
     STRING_EXTEND_CHARS,
     ITER_CLONED_COLLECT,
@@ -1791,7 +1763,6 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
             ["to_os_string", ..] => implicit_clone::check(cx, expr, sym::OsStr),
             ["to_path_buf", ..] => implicit_clone::check(cx, expr, sym::Path),
             ["to_vec", ..] => implicit_clone::check(cx, expr, sym::slice),
-            ["for_each", ..] => excessive_for_each::lint(cx, expr, &arg_lists),
             _ => {},
         }