1 files changed, 63 insertions, 0 deletions
diff --git a/tests/ui/iterators/into-iter-on-arrays-lint.rs b/tests/ui/iterators/into-iter-on-arrays-lint.rs
new file mode 100644
index 00000000000..582d5cadd06
--- /dev/null
+++ b/tests/ui/iterators/into-iter-on-arrays-lint.rs
@@ -0,0 +1,63 @@
+// run-pass
+// run-rustfix
+// rustfix-only-machine-applicable
+
+#[allow(unused_must_use)]
+fn main() {
+    let small = [1, 2];
+    let big = [0u8; 33];
+
+    // Expressions that should trigger the lint
+    small.into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    [1, 2].into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    big.into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    [0u8; 33].into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+
+    Box::new(small).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new([1, 2]).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new(big).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new([0u8; 33]).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+
+    Box::new(Box::new(small)).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new(Box::new([1, 2])).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new(Box::new(big)).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+    Box::new(Box::new([0u8; 33])).into_iter();
+    //~^ WARNING this method call resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this changes meaning
+
+    // Expressions that should not
+    (&[1, 2]).into_iter();
+    (&small).into_iter();
+    (&[0u8; 33]).into_iter();
+    (&big).into_iter();
+
+    for _ in &[1, 2] {}
+    (&small as &[_]).into_iter();
+    small[..].into_iter();
+    std::iter::IntoIterator::into_iter(&[1, 2]);
+
+    #[allow(array_into_iter)]
+    [0, 1].into_iter();
+}