syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":".rvalue_scopes"}]}
source_snippet:                     .rvalue_scopes
context_before:                 let (temp_lifetime, backwards_incompatible) = self
context_after:                     .temporary_scope(self.region_scope_tree, expr.hir_id.local_id);