syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"CoverageKind::BlockMarker"}]}
source_snippet:                         CoverageKind::BlockMarker { .. } | CoverageKind::SpanMarker { .. },
context_before:                         // MIR building, and are not needed after InstrumentCoverage.
context_after:                     )