syntax_data: {"ast_node_type":"variable","tokens":[{"end":37,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let inject_block_marker =
context_before:         if let Some(mcdc_info) = self.mcdc_info.as_mut() {
context_after:                 |source_info, block| self.markers.inject_block_marker(cfg, source_info, block);