Handle exotic early blockers

Author: ilevkivskyi

mypy/build_worker/worker.py

@@ -321,24 +321,27 @@ def flush_errors(filename: str | None, new_messages: list[str], is_serious: bool
         # We never flush errors in the worker, we send them back to coordinator.
         pass
 
-    return BuildManager(
-        data_dir,
-        search_paths,
-        ignore_prefix=os.getcwd(),
-        source_set=source_set,
-        reports=None,
-        options=options,
-        version_id=__version__,
-        plugin=plugin,
-        plugins_snapshot=snapshot,
-        errors=ctx.errors,
-        error_formatter=None if options.output is None else OUTPUT_CHOICES.get(options.output),
-        flush_errors=flush_errors,
-        fscache=ctx.fscache,
-        stdout=sys.stdout,
-        stderr=sys.stderr,
-        parallel_worker=True,
-    )
+    try:
+        return BuildManager(
+            data_dir,
+            search_paths,
+            ignore_prefix=os.getcwd(),
+            source_set=source_set,
+            reports=None,
+            options=options,
+            version_id=__version__,
+            plugin=plugin,
+            plugins_snapshot=snapshot,
+            errors=ctx.errors,
+            error_formatter=None if options.output is None else OUTPUT_CHOICES.get(options.output),
+            flush_errors=flush_errors,
+            fscache=ctx.fscache,
+            stdout=sys.stdout,
+            stderr=sys.stderr,
+            parallel_worker=True,
+        )
+    except CompileError:
+        return None
 
 
 def console_entry() -> None: