syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // Here, if we have `for<'x> T: Foo1<'x>`, then what do we know?
context_before:         //
context_after:         // The answer is that we know `for<'x,'b> T: Bar1<'x,'b>`. The