syntax_data: {"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let vtable_size = ptr_size * u64::try_from(vtable_entries.len()).unwrap();
context_after:     let mut vtable = Allocation::new(vtable_size, ptr_align, AllocInit::Uninit, ());