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Signals

You may send messages to the standard error output stream during compilation.
@debug prints a message. @warn can be be turned off and prints to the trace. @error throws a fatal error.
@debug 10em + 12em;


@mixin adjust-location($x, $y) {
  @if unitless($x) {
    @warn "Assuming #{$x} to be in pixels";
    $x: 1px * $x;
  }
  @if unitless($y) {
    @warn "Assuming #{$y} to be in pixels";
    $y: 1px * $y;
  }
  position: relative; left: $x; top: $y;
}


@mixin adjust-position($x, $y) {
  @if unitless($x) {
    @error "$x may not be unitless, was #{$x}.";
  }
  @if unitless($y) {
    @error "$y may not be unitless, was #{$y}.";
  }
  position: relative; left: $x; top: $y;
}