Auto merge of #13512 - samueltardieu:issue-13511, r=xFrednet

`infinite_loop`: continuing an outer loop leaves the inner loop

changelog: [`infinite_loop`]: detect a `continue` targeting an outer loop

Fix #13511

tests/ui/infinite_loops.rs

@@ -390,4 +390,42 @@ fn span_inside_fn() {
     }
 }
 
+fn continue_outer() {
+    // Should not lint (issue #13511)
+    let mut count = 0;
+    'outer: loop {
+        if count != 0 {
+            break;
+        }
+
+        loop {
+            count += 1;
+            continue 'outer;
+        }
+    }
+
+    // This should lint as we continue the loop itself
+    'infinite: loop {
+        //~^ ERROR: infinite loop detected
+        loop {
+            continue 'infinite;
+        }
+    }
+    // This should lint as we continue an inner loop
+    loop {
+        //~^ ERROR: infinite loop detected
+        'inner: loop {
+            loop {
+                continue 'inner;
+            }
+        }
+    }
+
+    // This should lint as we continue the loop itself
+    loop {
+        //~^ ERROR: infinite loop detected
+        continue;
+    }
+}
+
 fn main() {}

tests/ui/infinite_loops.stderr

@@ -255,5 +255,67 @@ LL | |     })
    |
    = help: if this is not intended, try adding a `break` or `return` condition in the loop
 
-error: aborting due to 17 previous errors
+error: infinite loop detected
+  --> tests/ui/infinite_loops.rs:408:5
+   |
+LL | /     'infinite: loop {
+LL | |
+LL | |         loop {
+LL | |             continue 'infinite;
+LL | |         }
+LL | |     }
+   | |_____^
+   |
+help: if this is intentional, consider specifying `!` as function return
+   |
+LL | fn continue_outer() -> ! {
+   |                     ++++
+
+error: infinite loop detected
+  --> tests/ui/infinite_loops.rs:415:5
+   |
+LL | /     loop {
+LL | |
+LL | |         'inner: loop {
+LL | |             loop {
+...  |
+LL | |         }
+LL | |     }
+   | |_____^
+   |
+help: if this is intentional, consider specifying `!` as function return
+   |
+LL | fn continue_outer() -> ! {
+   |                     ++++
+
+error: infinite loop detected
+  --> tests/ui/infinite_loops.rs:417:9
+   |
+LL | /         'inner: loop {
+LL | |             loop {
+LL | |                 continue 'inner;
+LL | |             }
+LL | |         }
+   | |_________^
+   |
+help: if this is intentional, consider specifying `!` as function return
+   |
+LL | fn continue_outer() -> ! {
+   |                     ++++
+
+error: infinite loop detected
+  --> tests/ui/infinite_loops.rs:425:5
+   |
+LL | /     loop {
+LL | |
+LL | |         continue;
+LL | |     }
+   | |_____^
+   |
+help: if this is intentional, consider specifying `!` as function return
+   |
+LL | fn continue_outer() -> ! {
+   |                     ++++
+
+error: aborting due to 21 previous errors