syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub tupled_upvars_ty: I::Ty,
context_before:     /// until the upvar analysis, which happens late in HIR typeck.
context_after:     /// a function pointer that has the shape `for<'env> fn() -> (&'env T, ...)`.