syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"block"}]}
source_snippet:                 block = self.assert(block, Operand::Move(inbounds), true, overflow_err, span);
context_before:                 let overflow_err = AssertKind::Overflow(op, lhs.to_copy(), rhs.to_copy());
context_after:                 Rvalue::BinaryOp(op, Box::new((lhs, rhs)))