difftastic/vendored_parsers/tree-sitter-rust/queries/injections.scm

((macro_invocation
  (token_tree) @injection.content)
 (#set! injection.language "rust")
 (#set! injection.include-children))

((macro_rule
  (token_tree) @injection.content)
 (#set! injection.language "rust")
 (#set! injection.include-children))