syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // example `for<'c> Foo<'a,'c>: 'b` can be elaborated to
context_before:                 // We can basically ignore bound regions here. So for
context_after:                 // `'a: 'b`.