syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Aggregates, printed as array/tuple/struct/variant construction syntax.
context_before:             }
context_after:             (ty::ValTreeKind::Branch(_), ty::Array(..) | ty::Tuple(..) | ty::Adt(..)) => {