<===> input.scss
// libsass issue 736:  @return does not cause function exit
// https://github.com/sass/libsass/issues/736

@function contains-true($list) {
  @each $bool in $list {
    @if $bool {
      @return "found true";
    }
  }
  @return "nothing found";
}

.test {
  out: contains-true(true false false);
  out: contains-true(false true false);
  out: contains-true(false false true);
}

<===> output.css
.test {
  out: "found true";
  out: "found true";
  out: "found true";
}