{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"Pat::Expr(expr)"}]}
                    Pat::Expr(expr) => self.infer_mut_expr(expr, Mutability::Mut),
                self.body.walk_pats(target, &mut |pat| match self.body[pat] {
                    Pat::ConstBlock(block) => self.infer_mut_expr(block, Mutability::Not),