match type conversion helper functions in C code annotation

Cython/Compiler/Annotate.py

@@ -280,7 +280,7 @@ _parse_code = re.compile((
     br'(?P<trace>__Pyx_Trace[A-Za-z]+)|'
     br'(?:'
     br'(?P<pyx_macro_api>__Pyx_[A-Z][A-Z_]+)|'
-    br'(?P<pyx_c_api>__Pyx_[A-Z][a-z_][A-Za-z_]*)|'
+    br'(?P<pyx_c_api>(?:__Pyx_[A-Z][a-z_][A-Za-z_]*)|__pyx_convert_[A-Za-z_]*)|'
     br'(?P<py_macro_api>Py[A-Z][a-z]+_[A-Z][A-Z_]+)|'
     br'(?P<py_c_api>Py[A-Z][a-z]+_[A-Z][a-z][A-Za-z_]*)'
     br')(?=\()|'       # look-ahead to exclude subsequent '(' from replacement