syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"ty::Alias(ty::Opaque,"}]}
source_snippet:             ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => {
context_before:             ty::Placeholder(placeholder) => placeholder.print(self)?,
context_after:                 // We use verbose printing in 'NO_QUERIES' mode, to