syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // output looks really close to the syntax, where the `Bar = &'a ()` bit
context_before:         // `dyn for<'a> Foo<'a, Bar = &'a ()>`. When we mangle this, the
context_after:         // is under the same binders (`['a]`) as the `Foo<'a>` bit. However, we