syntax_data: {"ast_node_type":"impl","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Given an impl like `impl<T: Foo + Bar> Baz for T {}`, we have 2 nested
context_before:     ///
context_after:     /// subgoals whenever we use the impl as a candidate: `T: Foo` and `T: Bar`.