[FIR] Hide local type for return type of single expression function ^KT-51418 Fixed

compiler/testData/diagnostics/tests/inference/substitutions/hideLocalTypeForReturnTypeOfSingleExpressionFunction.kt

@@ -0,0 +1,30 @@
+// FIR_IDENTICAL
+// ISSUE: KT-51418
+
+abstract class A<T>
+private fun fPrivate() = test("private")
+fun fPublic() = test("public")
+
+private fun <T> test(t: T) = object : A<T>() {
+    fun bar(): T = t
+}
+
+fun main() {
+    fPrivate().bar()
+    fPublic().<!UNRESOLVED_REFERENCE!>bar<!>()
+    test(1).bar()
+}
+
+class FieldTest {
+    var result = ""
+
+    private val test = object {
+        fun bar() = object {
+            fun qux() = object {
+            }.also { result += "b" }
+        }.also { result += "a" }
+    }.also { result += "!" }
+
+    private val ttt = test.bar()
+    private val qqq = ttt.qux()
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideLocalTypeForReturnTypeOfSingleExpressionFunction.txt

@@ -0,0 +1,25 @@
+package
+
+private fun fPrivate(): test.`<no name provided>`<kotlin.String>
+public fun fPublic(): A<kotlin.String>
+public fun main(): kotlin.Unit
+private fun </*0*/ T> test(/*0*/ t: T): test.`<no name provided>`<T>
+
+public abstract class A</*0*/ T> {
+    public constructor A</*0*/ T>()
+    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 class FieldTest {
+    public constructor FieldTest()
+    private final val qqq: FieldTest.test.`<no name provided>`.bar.`<no name provided>`.qux.`<no name provided>`
+    public final var result: kotlin.String
+    private final val test: FieldTest.test.`<no name provided>`
+    private final val ttt: FieldTest.test.`<no name provided>`.bar.`<no name provided>`
+    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
+}
+