syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // from `rustc_middle::ty` during the computation of `tcx.predicates_of`),
context_before:                 // only affect certain debug messages (e.g. messages printed
context_after:                 // and should have no effect on any compiler output.