Function merge_value

src/lower2/stackmaps.rs:1137–1153

(a: &FrameValue, b: &FrameValue)

    instructions: &[Instruction],
    center: usize,
    constant_pool: &ConstantPool,
) -> String {
    let start = center.saturating_sub(8);
    let end = (center + 4).min(instructions.len().saturating_sub(1));
    (start..=end)
        .map(|index| {
            let marker = if index == center { ">" } else { " " };
            format!(
                "{marker} {index}: {}",
                describe_instruction(&instructions[index], constant_pool)
            )
        })
        .collect::<Vec<_>>()
        .join("\n")
}

fn transfer_instruction(
    instruction_index: usize,
    instruction: &Instruction,
    mut state: FrameState,