Delegated properties now cannot be used before initialization #KT-10869 Fixed

compiler/testData/diagnostics/tests/controlFlowAnalysis/delegatedPropertyEarlyAccess.kt

@@ -0,0 +1,32 @@
+// See also KT-10869: Accessing lazy properties from init causes IllegalArgumentException
+
+import kotlin.reflect.KProperty
+
+class CustomDelegate {
+    operator fun getValue(thisRef: Any?, prop: KProperty<*>): String = prop.name
+}
+
+class Kaboom() {
+    // Here and below we should have errors for simple AND delegated
+    init {
+        <!UNINITIALIZED_VARIABLE!>delegated<!>.hashCode()
+        <!UNINITIALIZED_VARIABLE!>simple<!>.hashCode()
+        withGetter.hashCode()
+    }
+
+    val other = <!UNINITIALIZED_VARIABLE!>delegated<!>
+
+    val another = <!UNINITIALIZED_VARIABLE!>simple<!>
+
+    val something = withGetter
+    
+    val delegated: String by CustomDelegate()
+
+    val simple = "xyz"
+
+    val withGetter: String
+        get() = "abc"
+
+    // No error should be here
+    val after = delegated
+}

compiler/testData/diagnostics/tests/controlFlowAnalysis/delegatedPropertyEarlyAccess.txt

@@ -0,0 +1,23 @@
+package
+
+public final class CustomDelegate {
+    public constructor CustomDelegate()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ prop: kotlin.reflect.KProperty<*>): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Kaboom {
+    public constructor Kaboom()
+    public final val after: kotlin.String
+    public final val another: kotlin.String = "xyz"
+    public final val delegated: kotlin.String
+    public final val other: kotlin.String
+    public final val simple: kotlin.String = "xyz"
+    public final val something: kotlin.String
+    public final val withGetter: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}