Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.1)
// ----

$namespace: "false";
$namespace: false;
@mixin namespacer($namespace) {
 @if $namespace {
  .#{$namespace} {
    @content;
  }
 }
  @else { 
    $placeholder: "t";
    .#{$placeholder} {
      @content;
    }
 }
}

@include namespacer($namespace) {
  &headerNav {
    content: "bar";
  }
}

SassMeister-output.css

.theaderNav {
  content: "bar";
}