syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"#[tracing::instrument(level"}]}
source_snippet:     #[tracing::instrument(level = "debug", skip(self, typing_env), ret)]
context_before:     /// it assumes that normalization will succeed.
context_after:     pub fn normalize_erasing_regions<T>(self, typing_env: ty::TypingEnv<'tcx>, value: T) -> T