syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for (trait_pred, assoc_items) in traits {
context_before:         // Print the rest of the trait types (that aren't Fn* family of traits)
context_after:             write!(self, "{}", if first { "" } else { " + " })?;