Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.3)
// Compass (v1.0.1)
// ----

$MS-scope-exists: feature-exists(global-variable-shadowing) == true;

$ms-context: null;

@mixin msr() {
  @if $MS-scope-exists {
    $ms-context: 'foo' !global;
  } @else {
    $ms-context: 'foo';
  }

  @content;

  @if $MS-scope-exists {
    $ms-context: null !global;
  } @else {
    $ms-context: null;
  }
}

div {
  @include msr() {
    foo: $ms-context;
  }
}

SassMeister-output.css

div {
  foo: "foo";
}