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Rather than relying on matching arbitrary nodes inside tree-sitter-graph and then checking whether they are of type ERROR or MISSING (which seems to have stopped working in later versions of tree-sitter), we now explicitly go through the tree-sitter tree, locating all of the error and missing nodes along the way. We then add these on to the graph output in the same format as was previously produced by tree-sitter-graph. Note that it's very likely that some of the syntax errors will move around a bit as a consequence of this change. In general, we don't expect syntax errors to have stable locations, as small changes in the grammar can cause an error to appear in a different position, even if the underlying (erroneous) code has not changed.