An assignment (=) occurs where compare (==) is probably intended

Defect 100628 (STATIC_C)
Checker PW.ASSIGN_WHERE_COMPARE_MEANT (subcategory none)
File: /src/mongo/db/query/plan_executor.cpp
Parse Warning (no function name available)
/src/mongo/db/query/plan_executor.cpp, line: 241
use of "=" where "==" may have been intended

        invariant(_currentState = kDisposed);