syntax_data: {"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let rhs = self.parse_rvalue(*rhs)?;
context_before:                 let lhs = self.parse_place(*lhs)?;
context_after:                 Ok(StatementKind::Assign(Box::new((lhs, rhs))))