syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"SafetyContext::UnsafeBlock"}]}
source_snippet:             SafetyContext::UnsafeBlock { ref mut used, .. } => {
context_before:             SafetyContext::BuiltinUnsafeBlock => {}
context_after:                 // Mark this block as useful (even inside `unsafe fn`, where it is technically