syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"assert!(!prefix.is_empty());"}]}
source_snippet:                     assert!(!prefix.is_empty());
context_before:                     // deprecation works for prefixed options only
context_after:                     early_dcx.early_warn(format!("`-{prefix} {key}`: {desc}"));