K2: reproduce KT-61844

compiler/testData/diagnostics/tests/resolve/invoke/privateInvokeOwner.fir.kt

@@ -0,0 +1,11 @@
+// ISSUE: KT-61844
+// FIR_DUMP
+
+class Foo<I, out O>(
+    private val transformer: (I) -> O,
+) {
+    fun <I, O> transform(foo: Foo<I, O>, bar: I) {
+        foo.<!FUNCTION_EXPECTED!>transformer<!>(bar)
+        foo.<!INVISIBLE_REFERENCE!>transformer<!>.invoke(bar)
+    }
+}

compiler/testData/diagnostics/tests/resolve/invoke/privateInvokeOwner.fir.txt

@@ -0,0 +1,15 @@
+FILE: privateInvokeOwner.fir.kt
+    public final class Foo<I, out O> : R|kotlin/Any| {
+        public constructor<I, out O>(transformer: R|(I) -> O|): R|Foo<I, O>| {
+            super<R|kotlin/Any|>()
+        }
+
+        private/*private to this*/ final val transformer: R|(I) -> O| = R|<local>/transformer|
+            private/*private to this*/ get(): R|(I) -> O|
+
+        public final fun <I, O> transform(foo: R|Foo<I, O>|, bar: R|I|): R|kotlin/Unit| {
+            R|<local>/foo|.<Expression 'transformer' of type 'kotlin/Function1<I, O>' cannot be invoked as a function>#(R|<local>/bar|)
+            R|<local>/foo|.R|SubstitutionOverride</Foo.transformer: R|(I) -> O|><HIDDEN: /Foo.transformer is invisible>#|.R|SubstitutionOverride<kotlin/Function1.invoke: R|O|>|(R|<local>/bar|)
+        }
+
+    }

compiler/testData/diagnostics/tests/resolve/invoke/privateInvokeOwner.kt

@@ -0,0 +1,11 @@
+// ISSUE: KT-61844
+// FIR_DUMP
+
+class Foo<I, out O>(
+    private val transformer: (I) -> O,
+) {
+    fun <I, O> transform(foo: Foo<I, O>, bar: I) {
+        foo.transformer(bar)
+        foo.transformer.invoke(bar)
+    }
+}

compiler/testData/diagnostics/tests/resolve/invoke/privateInvokeOwner.txt

@@ -0,0 +1,11 @@
+package
+
+public final class Foo</*0*/ I, /*1*/ out O> {
+    public constructor Foo</*0*/ I, /*1*/ out O>(/*0*/ transformer: (I) -> O)
+    private final val transformer: (I) -> O
+    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
+    public final fun </*0*/ I, /*1*/ O> transform(/*0*/ foo: Foo<I, O>, /*1*/ bar: I): kotlin.Unit
+}
+