syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// `for<'a> Foo<'_>: 'a`, and you instantiate your bound region `'a`
context_before: /// get unified with your placeholder region: if you want to check whether
context_after: /// with a placeholder region `'%a`, the variable `'_` would just be