For a better readability and understandability, Less variables should be defined at the beginning of their block.

`@charset` and `@import` rules are allowed before Less variable declarations.

## Noncompliant Code Example

    @charset "UTF-8";

    .mybox1 {
      color: @var1;
      @var1: blue; /* Noncompliant */
      @var2: green; /* Noncompliant */

      > .mybox2 {
        border-color: @var3;
        @var3: black; /* Noncompliant */
      }

      background-color: @var2;
      border: @var0;
    }

    @var0: 1px; /* Noncompliant */

## Compliant Solution

    @charset "UTF-8";

    @var0: 1px;

    .mybox1 {
      @var1: blue;
      @var2: green;
      color: @var1;

      > .mybox2 {
        @var3: black;
        border-color: @var3;
      }

      background-color: @var2;
      border: @var0;
    }