language: report special python IDs

artiq/coredevice/core.py

@@ -109,6 +109,7 @@ class Core:
             self.compiler.analyze(
                 core_language._registered_functions,
                 core_language._registered_classes,
+                core_language._special_ids,
                 core_language._registered_modules
             )
             self.analyzed = True

artiq/language/core.py

@@ -227,6 +227,12 @@ parallel = _ParallelContextManager()
 legacy_parallel = _ParallelContextManager()
 sequential = _SequentialContextManager()
 
+_special_ids = {
+    "parallel": id(parallel),
+    "legacy_parallel": id(legacy_parallel),
+    "sequential": id(sequential),
+}
+
 
 def delay_mu(duration):
     """Increases the RTIO time by the given amount (in machine units)."""