syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // HIR ty lowering (which means it's un-normalized).
context_before:                 // normalizing in the process, since `type_of` returns something directly from
context_after:                 let source_tail = normalize_with_depth_to(