[debugger] allow debug-evaluate to change stack and context values.

test/mjsunit/debug-evaluate-locals.js

Index: test/mjsunit/debug-evaluate-locals.js
diff --git a/test/mjsunit/debug-evaluate-locals.js b/test/mjsunit/debug-evaluate-locals.js
index d63aa9db3af373e86ae41478d4f108275fbd5c7f..1788bd8ce2ea882ed2395a919a9472383adf686e 100644
--- a/test/mjsunit/debug-evaluate-locals.js
+++ b/test/mjsunit/debug-evaluate-locals.js
@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --expose-debug-as debug --debug-eval-readonly-locals
+// Flags: --expose-debug-as debug
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
@@ -113,20 +113,17 @@ function listener(event, exec_state, event_data, data) {
       checkFrame1(exec_state.frame(1));
       checkFrame2(exec_state.frame(2));
 
-      // Evaluating a and b on frames 0, 1 and 2 produces 1, 2, 3, 4, 5 and 6.
       assertEquals(1, exec_state.frame(0).evaluate('a').value());
       assertEquals(2, exec_state.frame(0).evaluate('b').value());
       assertEquals(5, exec_state.frame(0).evaluate('eval').value());
       assertEquals(3, exec_state.frame(1).evaluate('a').value());
-      // Reference error because g does not reference b.
-      assertThrows(() => exec_state.frame(1).evaluate('b'), ReferenceError);
+      assertEquals(4, exec_state.frame(1).evaluate('b').value());
       assertEquals("function",
                    typeof exec_state.frame(1).evaluate('eval').value());
       assertEquals(5, exec_state.frame(2).evaluate('a').value());
       assertEquals(6, exec_state.frame(2).evaluate('b').value());
       assertEquals("function",
                    typeof exec_state.frame(2).evaluate('eval').value());
-      // Assignments to local variables only have temporary effect.
       assertEquals("foo",
                    exec_state.frame(0).evaluate('a = "foo"').value());
       assertEquals("bar",
@@ -145,7 +142,7 @@ Debug.setListener(listener);
 
 var f_result = f();
 
-assertEquals(4, f_result);
+assertEquals("foobar", f_result);
 
 // Make sure that the debug event listener was invoked.
 assertFalse(exception, "exception in listener")