Macro const_if::const_if

macro_rules! const_if {
    ($cond: expr => $if_true:expr;$if_false: expr) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;  else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr; else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr; else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr; else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr;elif $cond7: expr => $if_t7:expr; else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr;elif $cond7: expr => $if_t7:expr;elif $cond8: expr => $if_t8: expr;else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr;elif $cond7: expr => $if_t7:expr;elif $cond8: expr => $if_t8: expr;elif $cond9: expr => $if_t9: expr;else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr;elif $cond7: expr => $if_t7:expr;elif $cond8: expr => $if_t8: expr;elif $cond9: expr => $if_t9: expr;elif $cond10: expr => $if_t10: expr;else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr; elif $cond3: expr => $if_t3: expr; elif $cond4: expr => $if_t4: expr;elif $cond5: expr => $if_t5: expr;elif $cond6: expr => $if_t6:expr;elif $cond7: expr => $if_t7:expr;elif $cond8: expr => $if_t8: expr;elif $cond9: expr => $if_t9: expr;elif $cond10: expr => $if_t10: expr;elif $cond11: expr => $if_t11: expr;else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    elif $cond18: expr => $if_t18: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    elif $cond18: expr => $if_t18: expr;
    elif $cond19: expr => $if_t19: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    elif $cond18: expr => $if_t18: expr;
    elif $cond19: expr => $if_t19: expr;
    elif $cond20: expr => $if_t20: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    elif $cond18: expr => $if_t18: expr;
    elif $cond19: expr => $if_t19: expr;
    elif $cond20: expr => $if_t20: expr;
    elif $cond21: expr => $if_t21: expr;
    else $if_false:expr ) => { ... };
    ($cond : expr => $if_true: expr; elif $cond2: expr => $if_t2:expr;
    elif $cond3: expr => $if_t3: expr;
    elif $cond4: expr => $if_t4: expr;
    elif $cond5: expr => $if_t5: expr;
    elif $cond6: expr => $if_t6:expr;
    elif $cond7: expr => $if_t7:expr;
    elif $cond8: expr => $if_t8: expr;
    elif $cond9: expr => $if_t9: expr;
    elif $cond10: expr => $if_t10: expr;
    elif $cond11: expr => $if_t11: expr;
    elif $cond12: expr => $if_t12: expr;
    elif $cond13: expr => $if_t13: expr;
    elif $cond14: expr => $if_t14: expr;
    elif $cond15: expr => $if_t15: expr;
    elif $cond16: expr => $if_t16: expr;
    elif $cond17: expr => $if_t17: expr;
    elif $cond18: expr => $if_t18: expr;
    elif $cond19: expr => $if_t19: expr;
    elif $cond20: expr => $if_t20: expr;
    elif $cond21: expr => $if_t21: expr;
    elif $cond22: expr => $if_t22: expr;
    else $if_false:expr ) => { ... };
}

All magic happens there