syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // FIXME: This doesn't check for malformed libcore that defines, e.g.,
context_before:             } else if let Some(target_kind) = tcx.fn_trait_kind_from_def_id(trait_ref.def_id) {
context_after:                 // `trait Fn { fn call_once(&self) { .. } }`. This is mostly for extension