syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // report these errors right here; this doesn't actually feel
context_before:     // `<i32 as Foo>::Bar` where `i32` does not implement `Foo`. We
context_after:     // right to me, because constructing the environment feels like a