syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"candidates.next().is_none(),"}]}
source_snippet:             candidates.next().is_none(),
context_before:         assert!(
context_after:             "did not expect duplicate `ConstParamHasTy` for `{self:?}` in param-env: {env:#?}"