When we have a method like:

public someType someMethod() {
  synchronized (someObject) {
    doSomething();
    return something;
  }
}

we get a msg like:

"The method someMethod in class SomeClass is missing an explicit return ImplicitReturnStatement"

which I consider incorrect in this specific construct.

I reported this issue on npm-groovy-lint, but the response I got was, "this is a CodeNarc issue".
See:
nvuillam/npm-groovy-lint#264