syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // The answer is that we know `for<'x,'b> T: Bar1<'x,'b>`. The
context_before:         // Here, if we have `for<'x> T: Foo1<'x>`, then what do we know?
context_after:         // reason is similar to the previous example: any impl of