syntax_data: {"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"discr_diff,"}]}
source_snippet:             discr_diff,
context_before:         StatementKind::Assign(Box::new((
context_after:             Rvalue::BinaryOp(BinOp::Sub, Box::new((Operand::Copy(discr), start_const))),