syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow)"}]}
source_snippet:         PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow)
context_before:         // Borrows pointing to "null" are UB even if the pointee is a ZST.
context_after:         | PlaceContext::MutatingUse(MutatingUseContext::Borrow) => {