syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // yield a type like `for<'a> &'a i32`. In general, we
context_before:         // regions. For example, `for<'a> Foo<&'a i32> : Copy` would
context_after:         // maintain the invariant that we never manipulate bound