syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// The upvars captured by the closure. Remains an inference variable
context_before:     pub closure_sig_as_fn_ptr_ty: I::Ty,
context_after:     /// until the upvar analysis, which happens late in HIR typeck.