Fix bug in implicit_return.

Bug was already covered by test, but test was not checked for.

clippy_lints/src/implicit_return.rs

@@ -90,6 +90,12 @@ fn expr_match(cx: &LateContext<'_, '_>, expr: &rustc::hir::Expr) {
                 if let Some(expr) = &block.expr {
                     Self::expr_match(cx, expr);
                 }
+                // only needed in the case of `break` with `;` at the end
+                else if let Some(stmt) = block.stmts.last() {
+                    if let rustc::hir::StmtKind::Semi(expr, ..) = &stmt.node {
+                        Self::expr_match(cx, expr);
+                    }
+                }
             },
             // skip if it already has a return statement
             ExprKind::Ret(..) => (),

tests/ui/implicit_return.stderr

@@ -30,6 +30,12 @@ error: missing return statement
 38 |             true
    |             ^^^^ help: add `return` as shown: `return true`
 
+error: missing return statement
+  --> $DIR/implicit_return.rs:46:9
+   |
+46 |         break true;
+   |         ^^^^^^^^^^ help: change `break` to `return` as shown: `return true`
+
 error: missing return statement
   --> $DIR/implicit_return.rs:52:9
    |
@@ -42,5 +48,5 @@ error: missing return statement
 54 |     let _ = || true;
    |                ^^^^ help: add `return` as shown: `return true`
 
-error: aborting due to 7 previous errors
+error: aborting due to 8 previous errors