syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":".type_of(alias_ty.def_id)"}]}
source_snippet:                     .type_of(alias_ty.def_id)
context_before:                 self.tcx
context_after:                     .instantiate(self.tcx, alias_ty.args)