fix compiler (#6615)

Lib/test/test_inspect/test_inspect.py

@@ -957,8 +957,6 @@ class TestGetsourceStdlib(unittest.TestCase):
 
 class TestGetsourceInteractive(unittest.TestCase):
     @support.force_not_colorized
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_getclasses_interactive(self):
         # bpo-44648: simulate a REPL session;
         # there is no `__file__` in the __main__ module

Lib/test/test_unittest/test_case.py

@@ -1970,8 +1970,6 @@ test case
             del case
             self.assertFalse(wr())
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_no_exception_leak(self):
         # Issue #19880: TestCase.run() should not keep a reference
         # to the exception

crates/vm/src/frame.rs

@@ -1739,7 +1739,42 @@ impl ExecutingFrame<'_> {
         // We do not have any more blocks to unwind. Inspect the reason we are here:
         match reason {
             UnwindReason::Raising { exception } => Err(exception),
-            UnwindReason::Returning { value } => Ok(Some(ExecutionResult::Return(value))),
+            UnwindReason::Returning { value } => {
+                // Clear tracebacks of exceptions in fastlocals to break reference cycles.
+                // This is needed because when returning from inside an except block,
+                // the exception cleanup code (e = None; del e) is skipped, leaving the
+                // exception with a traceback that references this frame, which references
+                // the exception in fastlocals, creating a cycle that can't be collected
+                // since RustPython doesn't have a tracing GC.
+                //
+                // We only clear tracebacks of exceptions that:
+                // 1. Are not the return value itself (will be needed by caller)
+                // 2. Are not the current active exception (still being handled)
+                // 3. Have a traceback whose top frame is THIS frame (we created it)
+                let current_exc = vm.current_exception();
+                let fastlocals = self.fastlocals.lock();
+                for obj in fastlocals.iter().flatten() {
+                    // Skip if this object is the return value
+                    if obj.is(&value) {
+                        continue;
+                    }
+                    if let Ok(exc) = obj.clone().downcast::<PyBaseException>() {
+                        // Skip if this is the current active exception
+                        if current_exc.as_ref().is_some_and(|cur| exc.is(cur)) {
+                            continue;
+                        }
+                        // Only clear if traceback's top frame is this frame
+                        if exc
+                            .__traceback__()
+                            .is_some_and(|tb| core::ptr::eq::<Py<Frame>>(&*tb.frame, self.object))
+                        {
+                            exc.set_traceback_typed(None);
+                        }
+                    }
+                }
+                drop(fastlocals);
+                Ok(Some(ExecutionResult::Return(value)))
+            }
             UnwindReason::Break { .. } | UnwindReason::Continue { .. } => {
                 self.fatal("break or continue must occur within a loop block.")
             } // UnwindReason::NoWorries => Ok(None),

crates/vm/src/vm/compile.rs

@@ -115,11 +115,14 @@ impl VirtualMachine {
             .compile(source, compiler::Mode::Exec, source_path.clone())
             .map_err(|err| self.new_syntax_error(&err, Some(source)))?;
         // trace!("Code object: {:?}", code_obj.borrow());
-        scope.globals.set_item(
-            identifier!(self, __file__),
-            self.new_pyobj(source_path),
-            self,
-        )?;
+        // Only set __file__ for real file paths, not pseudo-paths like <string>
+        if !(source_path.starts_with('<') && source_path.ends_with('>')) {
+            scope.globals.set_item(
+                identifier!(self, __file__),
+                self.new_pyobj(source_path),
+                self,
+            )?;
+        }
         self.run_code_obj(code_obj, scope)
     }