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Matthias Krüger
3944c8ce44
fix: Emit suggestion filename if primary diagnostic span is dummy While working on using `annotate-snippets` as `rustc`'s emitter, I came across [`tests/ui/resolve/resolve-conflict-extern-crate-vs-extern-crate.stderr`](https://github.com/rust-lang/rust/blob/b03b3a7ec92682be2917540b679478d41c95a30c/tests/ui/resolve/resolve-conflict-extern-crate-vs-extern-crate.stderr), which lacked a filename for both the annotation and the suggestion, which seemed like a bug to me. After some investigation, I found that this is happening because the primary span is a dummy, so its filename doesn't get output, and its filename matches the one for the suggestion, so the suggestion's filename doesn't get output. To fix this issue, I made it so that the filename for a suggestion will get output if the primary span is a dummy.