syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // of `layout_of` and is thus a small performance improvement.
context_before:     // the where bounds to their hidden types. This reduces overall uncached invocations
context_after:     let typing_env = typing_env.with_post_analysis_normalized(tcx);