Revert 'isEmpty' transformation

compiler/testData/codegen/box/builtinStubMethods/Collection.kt

@@ -1,6 +1,6 @@
 class MyCollection<T>: Collection<T> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: T): Boolean = false
     override fun iterator(): Iterator<T> = throw UnsupportedOperationException()
     override fun containsAll(c: Collection<T>): Boolean = false

compiler/testData/codegen/box/builtinStubMethods/List.kt

@@ -1,6 +1,6 @@
 class MyList<T>: List<T> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: T): Boolean = false
     override fun iterator(): Iterator<T> = throw Error()
     override fun containsAll(c: Collection<T>): Boolean = false

compiler/testData/codegen/box/builtinStubMethods/ListWithAllImplementations.kt

@@ -1,6 +1,6 @@
 class MyList<T>(val v: T): List<T> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: T): Boolean = false
     override fun iterator(): Iterator<T> = throw Error()
     override fun containsAll(c: Collection<T>): Boolean = false

compiler/testData/codegen/box/builtinStubMethods/ListWithAllInheritedImplementations.kt

@@ -13,7 +13,7 @@ open class Super<T>(val v: T) {
 
 class MyList<T>(v: T): Super<T>(v), List<T> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: T): Boolean = false
     override fun iterator(): Iterator<T> = throw Error()
     override fun containsAll(c: Collection<T>): Boolean = false

compiler/testData/codegen/box/builtinStubMethods/Map.kt

@@ -1,6 +1,6 @@
 class MyMap<K, V>: Map<K, V> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun containsKey(key: K): Boolean = false
     override fun containsValue(value: V): Boolean = false
     override fun get(key: K): V? = null

compiler/testData/codegen/box/builtinStubMethods/MapWithAllImplementations.kt

@@ -1,6 +1,6 @@
 class MyMap<K, V>: Map<K, V> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun containsKey(key: K): Boolean = false
     override fun containsValue(value: V): Boolean = false
     override fun get(key: K): V? = null

compiler/testData/codegen/box/builtinStubMethods/SubstitutedList.kt

@@ -1,6 +1,6 @@
 class MyList: List<String> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: String): Boolean = false
     override fun iterator(): Iterator<String> = throw Error()
     override fun containsAll(c: Collection<String>): Boolean = false

compiler/testData/codegen/box/builtinStubMethods/implementationInTrait.kt

@@ -4,7 +4,7 @@ interface Addable {
 
 class C : Addable, List<String> {
     override val size: Int get() = null!!
-    override val isEmpty: Boolean get() = null!!
+    override fun isEmpty(): Boolean = null!!
     override fun contains(o: String): Boolean = null!!
     override fun iterator(): Iterator<String> = null!!
     override fun containsAll(c: Collection<String>): Boolean = null!!

compiler/testData/codegen/box/builtinStubMethods/inheritedImplementations.kt

@@ -6,7 +6,7 @@ open class SetStringImpl {
 
 class S : Set<String>, SetStringImpl() {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: String): Boolean = false
     override fun iterator(): Iterator<String> = null!!
     override fun containsAll(c: Collection<String>) = false

compiler/testData/codegen/box/builtinStubMethods/manyTypeParametersWithUpperBounds.kt

@@ -2,10 +2,10 @@ import java.util.Collections
 
 class A<U : Number, V : U, W : V> : Set<W> {
     override val size: Int get() = 0
-    override val isEmpty: Boolean get() = true
+    override fun isEmpty(): Boolean = true
     override fun contains(o: W): Boolean = false
     override fun iterator(): Iterator<W> = Collections.emptySet<W>().iterator()
-    override fun containsAll(c: Collection<W>): Boolean = c.isEmpty
+    override fun containsAll(c: Collection<W>): Boolean = c.isEmpty()
 }
 
 fun expectUoe(block: () -> Any) {

compiler/testData/codegen/box/builtinStubMethods/nonTrivialSubstitution.kt

@@ -3,7 +3,7 @@ import java.util.ArrayList
 class MyCollection<T> : Collection<List<Iterator<T>>> {
     override fun iterator() = null!!
     override val size: Int get() = null!!
-    override val isEmpty: Boolean get() = null!!
+    override fun isEmpty(): Boolean = null!!
     override fun contains(o: List<Iterator<T>>): Boolean = null!!
     override fun containsAll(c: Collection<List<Iterator<T>>>): Boolean = null!!
 }