syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Creates a false edge to `imaginary_target` and a real edge to
context_before: impl<'a, 'tcx> Builder<'a, 'tcx> {
context_after:     /// real_target. If `imaginary_target` is none, or is the same as the real