syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // `T:Foo1<'x>` must show that `for<'b> T: Bar1<'x, 'b>`. So
context_before:         // reason is similar to the previous example: any impl of
context_after:         // basically we would want to collapse the bound lifetimes from