Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.2.10)
// Compass (v0.13.alpha.4)
// ----

$inputs-list: 'input[type="email"]',
              'input[type="number"]',
              'input[type="password"]',
              'input[type="search"]',
              'input[type="tel"]',
              'input[type="text"]',
              'input[type="url"]',

              // Webkit & Gecko may change the display of these in the future
              'input[type="color"]',
              'input[type="date"]',
              'input[type="datetime"]',
              'input[type="datetime-local"]',
              'input[type="month"]',
              'input[type="time"]',
              'input[type="week"]';

@function selector-append($list, $append) {
    $return: ();
    @each $item in $list {
        $return: join($return, unquote($item) + unquote($append), comma);
    }
    @return $return;
}

#{selector-append(selector-append($inputs-list, '.foo'), '.error')} {
    foo: bar;
}

SassMeister-output.css

input[type="email"].foo.error, input[type="number"].foo.error, input[type="password"].foo.error, input[type="search"].foo.error, input[type="tel"].foo.error, input[type="text"].foo.error, input[type="url"].foo.error, input[type="color"].foo.error, input[type="date"].foo.error, input[type="datetime"].foo.error, input[type="datetime-local"].foo.error, input[type="month"].foo.error, input[type="time"].foo.error, input[type="week"].foo.error {
  foo: bar;
}