Fix never_loop false positive

Closes #4058

clippy_lints/src/loops.rs

@@ -727,8 +727,7 @@ fn never_loop_expr(expr: &Expr, main_loop_id: HirId) -> NeverLoopResult {
                 NeverLoopResult::AlwaysBreak
             }
         },
-        ExprKind::Break(_, _) => NeverLoopResult::AlwaysBreak,
+        ExprKind::Break(_, ref e) | ExprKind::Ret(ref e) => {
-        ExprKind::Ret(ref e) => {
             if let Some(ref e) = *e {
                 combine_seq(never_loop_expr(e, main_loop_id), NeverLoopResult::AlwaysBreak)
             } else {

tests/ui/never_loop.rs

@@ -175,6 +175,17 @@ pub fn test15() {
     }
 }
 
+// Issue #4058: `continue` in `break` expression
+pub fn test16() {
+    let mut n = 1;
+    loop {
+        break if n != 5 {
+            n += 1;
+            continue;
+        };
+    }
+}
+
 fn main() {
     test1();
     test2();