Mixin and Variable Cascading in LESS

included_file.less

@value: #000;

.mixin {
  color: @value;
}

@value: #333;

.parametric() {
  color: @value;
  background: @value;
}

styles.css

.mixin {
  color: #999999;
}
.mixin {
  color: #999999;
  background: white;
}
.combinedmixin {
  color: #999999;
  background: white;
}
.combinedparametric {
  background: #999999;
  color: #999999;
  background: black;
}

styles.less

@import "included_file.less";

@value: #666;

.mixin {
    color: @value;
    background: white;
}

@value: #999;

.parametric() {
    color: @value;
    background: black;
}

.combinedmixin {
    .mixin;
}

.combinedparametric {
    .parametric;
}