1 files changed, 71 insertions, 11 deletions
diff --git a/src/tools/clippy/tests/ui/vec.rs b/src/tools/clippy/tests/ui/vec.rs
index dfed3a29a..0404d8cdb 100644
--- a/src/tools/clippy/tests/ui/vec.rs
+++ b/src/tools/clippy/tests/ui/vec.rs
@@ -1,9 +1,12 @@
 //@run-rustfix
 #![warn(clippy::useless_vec)]
-#![allow(clippy::nonstandard_macro_braces, clippy::uninlined_format_args)]
+#![allow(clippy::nonstandard_macro_braces, clippy::uninlined_format_args, unused)]
 
-#[derive(Debug)]
-struct NonCopy;
+use std::rc::Rc;
+
+struct StructWithVec {
+    _x: Vec<i32>,
+}
 
 fn on_slice(_: &[u8]) {}
 
@@ -60,14 +63,6 @@ fn main() {
     on_mut_slice(&mut vec![2; line.length]);
     on_mut_slice(&mut vec![2; line.length()]);
 
-    for a in vec![1, 2, 3] {
-        println!("{:?}", a);
-    }
-
-    for a in vec![NonCopy, NonCopy] {
-        println!("{:?}", a);
-    }
-
     on_vec(&vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
     on_mut_vec(&mut vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
 
@@ -75,4 +70,69 @@ fn main() {
     for a in vec![1; 201] {
         println!("{:?}", a);
     }
+
+    // https://github.com/rust-lang/rust-clippy/issues/2262#issuecomment-783979246
+    let _x: i32 = vec![1, 2, 3].iter().sum();
+
+    // Do lint
+    let mut x = vec![1, 2, 3];
+    x.fill(123);
+    dbg!(x[0]);
+    dbg!(x.len());
+    dbg!(x.iter().sum::<i32>());
+
+    let _x: &[i32] = &vec![1, 2, 3];
+
+    for _ in vec![1, 2, 3] {}
+
+    // Don't lint
+    let x = vec![1, 2, 3];
+    let _v: Vec<i32> = x;
+
+    let x = vec![1, 2, 3];
+    let _s = StructWithVec { _x: x };
+
+    // Explicit type annotation would make the change to [1, 2, 3]
+    // a compile error.
+    let _x: Vec<i32> = vec![1, 2, 3];
+
+    // Calling a Vec method through a mutable reference
+    let mut x = vec![1, 2, 3];
+    let re = &mut x;
+    re.push(4);
+
+    // Comparing arrays whose length is not equal is a compile error
+    let x = vec![1, 2, 3];
+    let y = vec![1, 2, 3, 4];
+    dbg!(x == y);
+
+    // Non-copy types
+    let _x = vec![String::new(); 10];
+    #[allow(clippy::rc_clone_in_vec_init)]
+    let _x = vec![Rc::new(1); 10];
+
+    // Too large
+    let _x = vec![1; 201];
+}
+
+#[clippy::msrv = "1.53"]
+fn above() {
+    for a in vec![1, 2, 3] {
+        let _: usize = a;
+    }
+
+    for a in vec![String::new(), String::new()] {
+        let _: String = a;
+    }
+}
+
+#[clippy::msrv = "1.52"]
+fn below() {
+    for a in vec![1, 2, 3] {
+        let _: usize = a;
+    }
+
+    for a in vec![String::new(), String::new()] {
+        let _: String = a;
+    }
 }