Generated by SassMeister.com.

SassMeister-input.sass

// ----
// Sass (v3.4.9)
// Compass (v1.0.1)
// ----

$themes: ("a": #ffcc00, "b": #00ddee)

=theme-color($prop: color)
  @each $theme, $color in $themes
    .theme--#{$theme} &
      #{$prop}: $color
      
a
  +theme-color

hr
  +theme-color(border-color)

SassMeister-output.css

.theme--a a {
  color: #ffcc00;
}
.theme--b a {
  color: #00ddee;
}

.theme--a hr {
  border-color: #ffcc00;
}
.theme--b hr {
  border-color: #00ddee;
}