Method pattern_helper_rotate

crates/codegen/src/compile.rs:5970–5987

Duplicate the effect of Python 3.10's ROT_* instructions using SWAPs.

(&mut self, mut count: usize)

    /// Duplicate the effect of Python 3.10's ROT_* instructions using SWAPs.
    fn pattern_helper_rotate(&mut self, mut count: usize) -> CompileResult<()> {
        // Rotate TOS (top of stack) to position `count` down
        // This is done by a series of swaps
        // For count=1, no rotation needed (already at top)
        // For count=2, swap TOS with item 1 position down
        // For count=3, swap TOS with item 2 positions down, then with item 1 position down
        while count > 1 {
            // Emit a SWAP instruction with the current count.
            emit!(
                self,
                Instruction::Swap {
                    i: u32::try_from(count).unwrap()
                }
            );
            count -= 1;
        }
        Ok(())
    }

    /// Helper to store a captured name for a star pattern.
    ///