mongodb-decoration -
    Search for a decoration on an object by typename and print it e.g.    (gdb) mongodb-decoration opCtx ReadConcernArgs    would print out a decoration on opCtx whose type name contains the string "ReadConcernArgs".

(gdb) mongodb-decoration opCtx ReadConcernArgs
Traceback (most recent call last):
  File "buildscripts/gdb/mongo.py", line 409, in invoke
    dec = get_decoration(gdb.parse_and_eval(expr), type_name_substr)
  File "buildscripts/gdb/mongo.py", line 318, in get_decoration
    for dec_type_name, dec in get_decorations(obj):
  File "buildscripts/gdb/mongo.py", line 267, in get_decorations
    decorable = obj.cast(lookup_type("mongo::Decorable<{}>".format(type_name)))
  File "buildscripts/gdb/mongo.py", line 194, in lookup_type
    raise gdb.error("Failed to get type, tried:\n%s" % "\n".join([str(exc) for exc in exceptions]))
gdb.error: Failed to get type, tried:
No type named mongo::Decorable<mongo::OperationContext*>.
No type named mongo::Decorable<mongo::OperationContext*>.
Error occurred in Python: Failed to get type, tried:
No type named mongo::Decorable<mongo::OperationContext*>.
No type named mongo::Decorable<mongo::OperationContext*>.