syntax_data: {"ast_node_type":"impl","tokens":[{"end":62,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // that might no longer work after the impl is stabilised,
context_before:     // Return ambiguity can also prevent people from writing code which depends on inference guidance
context_after:     // tests/ui/unstable-feature-bound/unstable_impl_method_selection.rs is one of the example.