syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Captures the closure's signature. This closure signature is "tupled", and
context_before:     pub closure_kind_ty: I::Ty,
context_after:     /// thus has a peculiar signature of `extern "rust-call" fn((Args, ...)) -> Ty`.