syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // FIXME(eddyb) this should ideally not be needed.
context_before:     let def_id = instance.def_id();
context_after:     let args = tcx.normalize_erasing_regions(ty::TypingEnv::fully_monomorphized(), instance.args);