syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// we pre-emptively visit any affected `!` expressions, and record extra
context_before:     /// That's awkward for branch coverage instrumentation, so to work around that
context_after:     /// information that [`Builder::visit_coverage_branch_condition`] can use to