syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                                 // opaque type we're printing, then skip the `::{opaque#1}`.
context_before:                                 // If the type alias directly starts with the `impl` of the
context_after:                                 self.print_def_path(parent, args)?;