syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // `tcx.instantiate_bound_regions_with_erased`.
context_before:     // inside of binders. We should be able to only use
context_after:     #[tracing::instrument(level = "debug", skip(self, typing_env))]