program main
  fn f64_zero_text() -> string
    call std.num.f64_to_string
      binary -
        float 2.5
        float 2.5
  fn f64_fractional_text() -> string
    call std.num.f64_to_string
      binary /
        float 7
        float 2
  fn f64_negative_text() -> string
    call std.num.f64_to_string
      binary -
        float 2.5
        float 4
  fn f64_whole_text() -> string
    call std.num.f64_to_string
      binary +
        float 7
        float 3
  fn main() -> i32
    call std.io.print_string
      call f64_zero_text
    call std.io.print_string
      call f64_fractional_text
    call std.io.print_string
      call f64_negative_text
    call std.io.print_string
      call f64_whole_text
    if
      binary =
        call std.string.len
          call f64_fractional_text
        int 3
      int 0
      int 1
  test "f64 zero to string"
    binary =
      call f64_zero_text
      string "0.0"
  test "f64 fractional to string"
    binary =
      call f64_fractional_text
      string "3.5"
  test "f64 negative to string"
    binary =
      call f64_negative_text
      string "-1.5"
  test "f64 whole to string"
    binary =
      call f64_whole_text
      string "10.0"
  test "f64 negative string length"
    binary =
      call std.string.len
        call f64_negative_text
      int 4
  test "f64 whole string length"
    binary =
      call std.string.len
        call f64_whole_text
      int 4