E4104

E4104#

Current loop expects different number of arguments than supplied with continue.

This error occurs when the number of arguments provided to a continue statement does not match the number of arguments expected by the loop. In a loop construct, when using continue, you must provide the same number of arguments as declared in the loop header.

For example, if a loop takes 2 arguments, any continue statement within that loop must also provide exactly 2 arguments. Providing too few or too many arguments will trigger this error.

Note that in a for loop, you can omit all arguments in a continue statement. In this case, the loop will use the default update expressions specified in the loop header. However, if you do provide arguments to continue, the number of arguments must match the number of loop variables.

For example, in a for loop with two variables:

  • continue (with no arguments) will use the default updates

  • continue x, y (with two arguments) is valid

  • continue x or continue x, y, z will trigger this error

错误示例#

pub fn f(x: Int, y: Int) -> Int {
  loop x, y {
    0, 0 => 0
    a, _ => continue a - 1
//          ^^^^^^^^^^^^^^ Error: Current loop expects 2 arguments, but
//                                `continue` is supplied with 1 arguments
  }
}

pub fn g(x : Int, y : Int) -> Int {
  for i = x, j = y; i + j < 10; i = i + 1, j = j + 1 {
    if i < j {
      continue i + 2, j + 1, i + j
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Error: Current loop expects 2 arguments, but
//                                       `continue` is supplied with 3 arguments
    }
  } else {
    42
  }
}

建议#

To fix this error, ensure that the number of arguments provided to continue matches the number of loop variables. For example,

pub fn f(x: Int, y: Int) -> Int {
  loop x, y {
    0, 0 => 0
    a, b => continue a - 1, b - 1
  }
}

pub fn g(x : Int, y : Int) -> Int {
  for i = x, j = y; i + j < 10; i = i + 1, j = j + 1 {
    if i < j {
      continue i + 2, j + 1
    } else {
      continue
    }
  } else {
    42
  }
}
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