save-analysis doesn't dump ref entry for struct name in static method calls

[staktrace]

Here's a small testcase:

struct Foo {
}

impl Foo {
  fn new() {
  }
}

fn main() {
  Foo::new();
}

If you run this through rustc -Z save-analysis and look at the save-analysis JSON file, you'll see that there is no entry for the Foo part of Foo::new(). This seems like a bug.

[staktrace]

/cc @nrc

[staktrace]

According to rustc -Z ast-json test.rs the expression is a ExprKind::Call where the Foo::new part would be a Path with two PathSegments. This seems to be processed in process_path here. Not obvious to me why it would fail, since the write_sub_paths_truncated at the end looks like it should deal with the first path segment.

[Xanewok]

cc me

[emilio]

I'm taking a look at this, fwiw. process_method_call does nothing with the segment, looks like it should.

[emilio]

Oh, it's a bit more subtle, but I see what's going on now.

[emilio]

I got a fix, testing to see if I can remove hacks to existing code now.

[emilio]

Fix is at #57474, but it's unclear to me how to add a test for this. Any doc I could look at?