syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // and should have no effect on any compiler output.
context_before:                 // from `rustc_middle::ty` during the computation of `tcx.predicates_of`),
context_after:                 // [Unless `-Zverbose-internals` is used, e.g. in the output of