syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"self.tcx"}]}
source_snippet:                                 self.tcx
context_before:                             if self.tcx.check_args_compatible(assoc.def_id, alias_args) {
context_after:                                     .type_of(assoc.def_id)