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<div class="box">I'm a box.</div>

/*I need the color here to be the output of darken(#0074d9,10%), not a string that lacks ().  */
.box {
  color: #0059a6;
  color: darken #0074d9, 10%;
}

// ----
// Sass (v3.4.4)
// Compass (v1.0.1)
// ----

$blue: #0074d9;
$variants: (
  dark: (darken, 11%),
);
$variant: dark;
@function c($color, $variant) {
  $prefix: nth(map-get($variants, $variant), 1);
  $value: nth(map-get($variants, $variant), 2);
  
  @return $prefix(#{$color}, #{$value});
}
/*I need the color here to be the output of darken(#0074d9,10%), not a string that lacks ().  */
.box {
  color: darken(#0074d9, 10%);
  color: c($blue, dark);
}

<div class="box">I'm a box.</div>