I got a PR yesterday that included something like this:

/// The tour de force of my career is [`foo.bar()`]
pub mod foo {
    pub fn bar() {}
}

In the current nightly rustdoc, foo.bar() neither resolves nor warns:

Our CI with --deny warnings did not catch this mistake (although I did 😄). I think rustdoc should trigger intra-doc-link-resolution-failure for this case.