syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // lifetimes.
context_before:     // Calculate when MIR locals have live storage. This gives us an upper bound of their
context_after:     let mut storage_live = MaybeStorageLive::new(std::borrow::Cow::Borrowed(always_live_locals))