breaks less css variable interpolation

[chiefjester]

Using variable interpolators for less breaks during compile.

this:

// Variables
@mySelector: banner;

// Usage
.@{mySelector} {
  font-weight: bold;
  line-height: 40px;
  margin: 0 auto;
}

becomes:

// Variables
@mySelector: banner;
// Usage
.@ {
  mySelector
}
{
  font-weight: bold;
  line-height: 40px;
  margin: 0 auto;
}

expected:

.@{mySelector} {

should be on the same line.