# Regression test for #5684: const_shift_worker must not crash when arg1 is
# empty.

read_json << EOF
{
    "modules": {
        "sshl": {
            "cells": {
                "sshlCell": {
                    "connections": {
                        "A": [],
                        "B": [3],
                        "Y": [1]
                    },
                    "parameters": {
                        "A_SIGNED": "1",
                        "A_WIDTH": "0",
                        "B_SIGNED": "0",
                        "B_WIDTH": "1",
                        "Y_WIDTH": "1"
                    },
                    "port_directions": {
                        "A": "input",
                        "B": "input",
                        "Y": "output"
                    },
                    "type": "$sshl"
                }
            },
            "ports": {
                "A": {
                    "bits": [],
                    "direction": "input"
                },
                "B": {
                    "bits": [3],
                    "direction": "input"
                },
                "Y": {
                    "bits": [1],
                    "direction": "output"
                }
            }
        }
    }
}
EOF

eval -set B 0 -show Y sshl