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I program in Haskell using lsp-mode with lsp-haskell. I need to have a working "jump to definition". xref-find-definitions using lsp--xref-backend sometimes fails to find the definition. xref-find-definitions using etags--xref-backend usually finds the definition together with other unrelated definitions. I want to have a command that runs lsp--xref-backend first, and if it doesn't find anything, runs etags--xref-backend. How do I achieve that? Simply setting xref-backend-functions to '(lsp--xref-backend etags--xref-backend) never invokes the etags backend even when the lsp backend doesn't find anything.

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