syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"degraded_branches:"}]}
source_snippet:         degraded_branches: &mut Vec<MCDCBranchSpan>,
context_before:         false_marker: BlockMarkerId,
context_after:     ) -> Option<(MCDCDecisionSpan, Vec<MCDCBranchSpan>)> {