syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"tcx.infer_ctxt().build_with_canonical(DUMMY_SP,"}]}
source_snippet:         tcx.infer_ctxt().build_with_canonical(DUMMY_SP, &canonical_goal);
context_before:     let (ref infcx, goal, _canonical_inference_vars) =
context_after:     debug!("evaluate_obligation: goal={:#?}", goal);