// Less merge markers glue to the property name, leaving only `:`
// (Prettier 3.9.5, prettier#19517)
a {
  box-shadow  +  : 0 0 1px #000;
  box-shadow+: inset 0 0 10px #555;
  background+_: url(two.png);
  // SPACED space-merge: valid Less, but postcss-less cannot parse it,
  // so this line has no Prettier oracle; it follows the same rule
  background  +_  : url(three.png);
}
.merge {
  @prefix: pre;
  @{prefix}-property-ish+       :high;
  pre-property-ish    +: middle;
}
