6 bugs in the compiler pipeline:

1. codegen.c:716: PyLong_FromLong result not NULL-checked, passed to ADDOP_LOAD_CONST. Also never DECREF'd.
2. codegen.c:3280: RETURN_IF_ERROR(scope) leaks mangled from _PyCompile_MaybeMangle.
3. codegen.c:792-818: mangled leaked on 7 macro early-return paths.
4. codegen.c:669: Unchecked _PyCompile_PushFBlock return, error silently lost.
5. compile.c:1096-1114: PyDict_GetItemRef new ref in orig never DECREF'd. Leaks on every inlined comprehension.
6. assemble.c:420-421: ERROR without PyErr_NoMemory() on bytecode overflow.

import sys
before = sys.gettotalrefcount()
for i in range(10000):
    compile("[x for x in range(10)]", "<test>", "eval")
after = sys.gettotalrefcount()
print(f"Leaked {after - before} refs")