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pubfnrootDecls(tree: Ast) []constNode.Index {
switch (tree.mode) {
.zig => returntree.extraDataSlice(tree.nodeData(.root).extra_range, Node.Index),
// Ensure that the returned slice points into the existing memory of the Ast
.zon => return (&tree.nodes.items(.data)[@backingInt(Node.Index.root)].node)[0..1],
}
}