Fix ecosystem regression

crates/ruff_linter/resources/test/fixtures/flake8_return/RET503.py

@@ -368,3 +368,11 @@ def bar() -> NoReturn:
     if baz() > 3:
         return 1
     bar()
+
+
+def f():
+    if a:
+        return b
+    else:
+        with c:
+            d

crates/ruff_linter/src/rules/flake8_return/rules/function.rs

@@ -534,9 +534,6 @@ fn has_implicit_return(checker: &mut Checker, stmt: &Stmt) -> bool {
         Stmt::With(ast::StmtWith { body, .. }) => {
             if let Some(last_stmt) = body.last() {
                 if has_implicit_return(checker, last_stmt) {
-                    if checker.settings.preview.is_disabled() {
-                        add_return_none(checker, stmt);
-                    }
                     return true;
                 }
             }

crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linter__rules__flake8_return__tests__RET503_RET503.py.snap

@@ -452,3 +452,21 @@ RET503.py:370:5: RET503 [*] Missing explicit `return` at the end of function abl
 369 369 |         return 1
 370 370 |     bar()
     371 |+    return None
+371 372 | 
+372 373 | 
+373 374 | def f():
+
+RET503.py:378:13: RET503 [*] Missing explicit `return` at the end of function able to return non-`None` value
+    |
+376 |     else:
+377 |         with c:
+378 |             d
+    |             ^ RET503
+    |
+    = help: Add explicit `return` statement
+
+ℹ Unsafe fix
+376 376 |     else:
+377 377 |         with c:
+378 378 |             d
+    379 |+            return None

crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linter__rules__flake8_return__tests__preview__RET503_RET503.py.snap

@@ -471,3 +471,25 @@ RET503.py:370:5: RET503 [*] Missing explicit `return` at the end of function abl
 369 369 |         return 1
 370 370 |     bar()
     371 |+    return None
+371 372 | 
+372 373 | 
+373 374 | def f():
+
+RET503.py:374:5: RET503 [*] Missing explicit `return` at the end of function able to return non-`None` value
+    |
+373 |   def f():
+374 |       if a:
+    |  _____^
+375 | |         return b
+376 | |     else:
+377 | |         with c:
+378 | |             d
+    | |_____________^ RET503
+    |
+    = help: Add explicit `return` statement
+
+ℹ Unsafe fix
+376 376 |     else:
+377 377 |         with c:
+378 378 |             d
+    379 |+    return None