syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // All Closure types with the same id represent
context_before:         (ty::Closure(a_id, a_args), ty::Closure(b_id, b_args)) if a_id == b_id => {
context_after:             // the (anonymous) type of the same closure expression. So