I'm trying to use string interpolation on my variable to reference another variable:

// Set up variable and mixin
$foo-baz: 20px;

@mixin do-this($bar) {
    width: $foo-#{$bar};
}

// Use mixin by passing 'baz' string as a param for use $foo-baz variable in the mixin
@include do-this('baz');

But when I do this, I get the following error:

Undefined variable: "$foo-".

Does Sass support PHP-style variable variables?

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