1 files changed, 29 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_lints/src/loops/explicit_into_iter_loop.rs b/src/tools/clippy/clippy_lints/src/loops/explicit_into_iter_loop.rs
new file mode 100644
index 000000000..175e2b382
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/loops/explicit_into_iter_loop.rs
@@ -0,0 +1,29 @@
+use super::EXPLICIT_INTO_ITER_LOOP;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_trait_method;
+use clippy_utils::source::snippet_with_applicability;
+use rustc_errors::Applicability;
+use rustc_hir::Expr;
+use rustc_lint::LateContext;
+use rustc_span::symbol::sym;
+
+pub(super) fn check(cx: &LateContext<'_>, self_arg: &Expr<'_>, call_expr: &Expr<'_>) {
+    let self_ty = cx.typeck_results().expr_ty(self_arg);
+    let self_ty_adjusted = cx.typeck_results().expr_ty_adjusted(self_arg);
+    if !(self_ty == self_ty_adjusted && is_trait_method(cx, call_expr, sym::IntoIterator)) {
+        return;
+    }
+
+    let mut applicability = Applicability::MachineApplicable;
+    let object = snippet_with_applicability(cx, self_arg.span, "_", &mut applicability);
+    span_lint_and_sugg(
+        cx,
+        EXPLICIT_INTO_ITER_LOOP,
+        call_expr.span,
+        "it is more concise to loop over containers instead of using explicit \
+            iteration methods",
+        "to write this more concisely, try",
+        object.to_string(),
+        applicability,
+    );
+}