Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.0)
// ----

$map:
    ('a', 'b');

// Expected output: ('a', 'b')
// Actual output: "a", "b"
    
.class--non-working {
  content: $map;
}

// Make it work:
.class--working {
  content: unquote("(#{$map})");
}

SassMeister-output.css

.class--non-working {
  content: "a", "b";
}

.class--working {
  content: ("a", "b");
}