Nested Style Rule Parse Error

[CresentCity]

The CSS Validator is treating a nested style rule as a parse error. Below is the link to the W3C CSS Nesting Module:

  https://www.w3.org/TR/css-nesting-1/

Here is the style rule from the CSS Nesting Module that the CSS Validator rejected:

.foo {
color: red;

.bar {
color: blue;
}
}