syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // may require doing analysis using its typing env.
context_before:         // a MIR body for the def kind, and some MIR passes (like promotion)
context_after:         DefKind::Closure | DefKind::InlineConst | DefKind::SyntheticCoroutineBody => {