syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"vtable.valid_range_mut().start"}]}
source_snippet:                         vtable.valid_range_mut().start = 1;
context_before:                         let mut vtable = scalar_unit(Pointer(AddressSpace::ZERO));
context_after:                         vtable