syntax_data: {"ast_node_type":"import","tokens":[{"end":61,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Also use the method name to create an unique def path.
context_before:     let span = tcx.def_span(opaque_ty_def_id);
context_after:     let trait_assoc_ty = tcx.at(span).create_def(