Licensing question

[Brian Leung]

If I copy and properly attribute code distributed under a GPL-compatible 
license like Apache 2 or Expat, will the code necessarily be ineligible for 
inclusion in GNU Emacs?

My specific problem: the tree-sitter library has garnered some interest as a 
tool for structured editing. Assume, for the sake of this discussion, that 
Emacs has support for it. I would like to read through 
https://github.com/nvim-treesitter/nvim-treesitter/ to figure out how to 
develop some user-facing features. But nvim-tree-sitter is distributed under an 
Apache 2 license, so I'm not sure what I can do with their code.

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