syntax_data: {"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut vtable = Allocation::new(vtable_size, ptr_align, AllocInit::Uninit, ());
context_before:     let vtable_size = ptr_size * u64::try_from(vtable_entries.len()).unwrap();