Specify when the range is empty in KDoc

generators/builtins/progressions.kt

@@ -82,7 +82,12 @@ public open class $progression
 
     override fun iterator(): ${t}Iterator = ${t}ProgressionIterator(first, last, step)
 
-    /** Checks if the progression is empty. */
+    /**
+     * Checks if the progression is empty.
+     
+     * Progression with a positive step is empty if its first element is greater than the last element.
+     * Progression with a negative step is empty if its first element is less than the last element.
+     */
     public open fun isEmpty(): Boolean = if (step > 0) first > last else first < last
 
     override fun equals(other: Any?): Boolean =

generators/builtins/ranges.kt

@@ -58,6 +58,11 @@ public class $range(start: $t, endInclusive: $t) : ${t}Progression(start, endInc
 
     override fun contains(value: $t): Boolean = first <= value && value <= last
 
+    /** 
+     * Checks whether the range is empty.
+     
+     * The range is empty if its start value is greater than the end value.
+     */
     override fun isEmpty(): Boolean = first > last
 
     override fun equals(other: Any?): Boolean =

generators/builtins/unsignedTypes.kt

@@ -587,6 +587,11 @@ public class ${elementType}Range(start: $elementType, endInclusive: $elementType
 
     override fun contains(value: $elementType): Boolean = first <= value && value <= last
 
+    /** 
+     * Checks if the range is empty.
+     
+     * The range is empty if its start value is greater than the end value.
+     */
     override fun isEmpty(): Boolean = first > last
 
     override fun equals(other: Any?): Boolean =
@@ -637,7 +642,12 @@ internal constructor(
 
     override fun iterator(): ${elementType}Iterator = ${elementType}ProgressionIterator(first, last, step)
 
-    /** Checks if the progression is empty. */
+    /** 
+     * Checks if the progression is empty.
+     
+     * Progression with a positive step is empty if its first element is greater than the last element.
+     * Progression with a negative step is empty if its first element is less than the last element.
+     */
     public open fun isEmpty(): Boolean = if (step > 0) first > last else first < last
 
     override fun equals(other: Any?): Boolean =