References expanded from macros are redundant

[krobelus]

Using

macro_rules! use_name {
    ($name:ident) => {
        let $name = 123;
        let $name = 123;
        let $name = 123;
    };
}

fn test() {
    use_name!(name);
}

textDocument/references on (name) reports three occurrences, each with the same location (the macro invocation).
The references seem redundant. We should deduplicate them?

It appears the vscode plugin already duplicates them but that's probably the wrong place to do that.

Found with the "bitflags" crate.