Auto merge of #9016 - Alexendoo:needless-return-test, r=giraffate

Use `RefCell` in `needless_return` tests

changelog: none

The stdio locks no longer fail to compile if the `return` is removed due to them now being `'static` (#9008)

3 files changed, 42 insertions, 46 deletions

diff --git a/tests/ui/needless_return.fixed b/tests/ui/needless_return.fixed
index 7c828430b78..166d9bea2e1 100644
--- a/tests/ui/needless_return.fixed
+++ b/tests/ui/needless_return.fixed
@@ -10,6 +10,8 @@
 )]
 #![warn(clippy::needless_return)]
 
+use std::cell::RefCell;
+
 macro_rules! the_answer {
     () => {
         42
@@ -86,17 +88,15 @@ fn test_nested_match(x: u32) {
     }
 }
 
-fn read_line() -> String {
-    use std::io::BufRead;
-    let stdin = ::std::io::stdin();
-    return stdin.lock().lines().next().unwrap().unwrap();
+fn temporary_outlives_local() -> String {
+    let x = RefCell::<String>::default();
+    return x.borrow().clone();
 }
 
 fn borrows_but_not_last(value: bool) -> String {
     if value {
-        use std::io::BufRead;
-        let stdin = ::std::io::stdin();
-        let _a = stdin.lock().lines().next().unwrap().unwrap();
+        let x = RefCell::<String>::default();
+        let _a = x.borrow().clone();
         String::from("test")
     } else {
         String::new()
@@ -197,17 +197,15 @@ async fn async_test_void_match(x: u32) {
     }
 }
 
-async fn async_read_line() -> String {
-    use std::io::BufRead;
-    let stdin = ::std::io::stdin();
-    return stdin.lock().lines().next().unwrap().unwrap();
+async fn async_temporary_outlives_local() -> String {
+    let x = RefCell::<String>::default();
+    return x.borrow().clone();
 }
 
 async fn async_borrows_but_not_last(value: bool) -> String {
     if value {
-        use std::io::BufRead;
-        let stdin = ::std::io::stdin();
-        let _a = stdin.lock().lines().next().unwrap().unwrap();
+        let x = RefCell::<String>::default();
+        let _a = x.borrow().clone();
         String::from("test")
     } else {
         String::new()
diff --git a/tests/ui/needless_return.rs b/tests/ui/needless_return.rs
index fe82af00e67..f38d3c3fcd9 100644
--- a/tests/ui/needless_return.rs
+++ b/tests/ui/needless_return.rs
@@ -10,6 +10,8 @@
 )]
 #![warn(clippy::needless_return)]
 
+use std::cell::RefCell;
+
 macro_rules! the_answer {
     () => {
         42
@@ -86,17 +88,15 @@ fn test_nested_match(x: u32) {
     }
 }
 
-fn read_line() -> String {
-    use std::io::BufRead;
-    let stdin = ::std::io::stdin();
-    return stdin.lock().lines().next().unwrap().unwrap();
+fn temporary_outlives_local() -> String {
+    let x = RefCell::<String>::default();
+    return x.borrow().clone();
 }
 
 fn borrows_but_not_last(value: bool) -> String {
     if value {
-        use std::io::BufRead;
-        let stdin = ::std::io::stdin();
-        let _a = stdin.lock().lines().next().unwrap().unwrap();
+        let x = RefCell::<String>::default();
+        let _a = x.borrow().clone();
         return String::from("test");
     } else {
         return String::new();
@@ -197,17 +197,15 @@ async fn async_test_void_match(x: u32) {
     }
 }
 
-async fn async_read_line() -> String {
-    use std::io::BufRead;
-    let stdin = ::std::io::stdin();
-    return stdin.lock().lines().next().unwrap().unwrap();
+async fn async_temporary_outlives_local() -> String {
+    let x = RefCell::<String>::default();
+    return x.borrow().clone();
 }
 
 async fn async_borrows_but_not_last(value: bool) -> String {
     if value {
-        use std::io::BufRead;
-        let stdin = ::std::io::stdin();
-        let _a = stdin.lock().lines().next().unwrap().unwrap();
+        let x = RefCell::<String>::default();
+        let _a = x.borrow().clone();
         return String::from("test");
     } else {
         return String::new();
diff --git a/tests/ui/needless_return.stderr b/tests/ui/needless_return.stderr
index 4c8be47b025..cadee6e00df 100644
--- a/tests/ui/needless_return.stderr
+++ b/tests/ui/needless_return.stderr
@@ -1,5 +1,5 @@
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:24:5
+  --> $DIR/needless_return.rs:26:5
    |
 LL |     return true;
    |     ^^^^^^^^^^^^ help: remove `return`: `true`
@@ -7,85 +7,85 @@ LL |     return true;
    = note: `-D clippy::needless-return` implied by `-D warnings`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:28:5
+  --> $DIR/needless_return.rs:30:5
    |
 LL |     return true;
    |     ^^^^^^^^^^^^ help: remove `return`: `true`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:33:9
+  --> $DIR/needless_return.rs:35:9
    |
 LL |         return true;
    |         ^^^^^^^^^^^^ help: remove `return`: `true`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:35:9
+  --> $DIR/needless_return.rs:37:9
    |
 LL |         return false;
    |         ^^^^^^^^^^^^^ help: remove `return`: `false`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:41:17
+  --> $DIR/needless_return.rs:43:17
    |
 LL |         true => return false,
    |                 ^^^^^^^^^^^^ help: remove `return`: `false`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:43:13
+  --> $DIR/needless_return.rs:45:13
    |
 LL |             return true;
    |             ^^^^^^^^^^^^ help: remove `return`: `true`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:50:9
+  --> $DIR/needless_return.rs:52:9
    |
 LL |         return true;
    |         ^^^^^^^^^^^^ help: remove `return`: `true`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:52:16
+  --> $DIR/needless_return.rs:54:16
    |
 LL |     let _ = || return true;
    |                ^^^^^^^^^^^ help: remove `return`: `true`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:56:5
+  --> $DIR/needless_return.rs:58:5
    |
 LL |     return the_answer!();
    |     ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `the_answer!()`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:60:5
+  --> $DIR/needless_return.rs:62:5
    |
 LL |     return;
    |     ^^^^^^^ help: remove `return`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:65:9
+  --> $DIR/needless_return.rs:67:9
    |
 LL |         return;
    |         ^^^^^^^ help: remove `return`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:67:9
+  --> $DIR/needless_return.rs:69:9
    |
 LL |         return;
    |         ^^^^^^^ help: remove `return`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:74:14
+  --> $DIR/needless_return.rs:76:14
    |
 LL |         _ => return,
    |              ^^^^^^ help: replace `return` with a unit value: `()`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:83:13
+  --> $DIR/needless_return.rs:85:13
    |
 LL |             return;
    |             ^^^^^^^ help: remove `return`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:85:14
+  --> $DIR/needless_return.rs:87:14
    |
 LL |         _ => return,
    |              ^^^^^^ help: replace `return` with a unit value: `()`
@@ -205,19 +205,19 @@ LL |         _ => return,
    |              ^^^^^^ help: replace `return` with a unit value: `()`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:211:9
+  --> $DIR/needless_return.rs:209:9
    |
 LL |         return String::from("test");
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::from("test")`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:213:9
+  --> $DIR/needless_return.rs:211:9
    |
 LL |         return String::new();
    |         ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::new()`
 
 error: unneeded `return` statement
-  --> $DIR/needless_return.rs:229:5
+  --> $DIR/needless_return.rs:227:5
    |
 LL |     return format!("Hello {}", "world!");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `format!("Hello {}", "world!")`