[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inference/regressions/kt2179.fir.kt

@@ -0,0 +1,46 @@
+// !CHECK_TYPE
+
+//KT-2179 Nested function literal breaks compiler
+package i
+
+//+JDK
+import java.util.*
+
+fun test() {
+    val sample1: List<List<Int?>> = arrayList(arrayList<Int?>(1, 7, null, 8))
+
+    //breaks compiler
+    val sample2 = sample1.map({it.map({it})})
+    checkSubtype<List<List<Int?>>>(sample2)
+
+    //breaks compiler
+    val sample3 = sample1.map({row -> row.map({column -> column})})
+    checkSubtype<List<List<Int?>>>(sample3)
+
+    //doesn't break compiler
+    val identity: (Int?) -> Int? = {column -> column}
+    val sample4 = sample1.map({row -> row.map(identity)})
+    checkSubtype<List<List<Int?>>>(sample4)
+}
+
+//------------
+
+fun <T> arrayList(vararg values: T) : ArrayList<T> = values.toCollection(ArrayList<T>(values.size))
+
+fun <T, R> Collection<T>.map(transform : (T) -> R) : List<R> {
+    return <!INAPPLICABLE_CANDIDATE!>mapTo<!>(java.util.<!UNRESOLVED_REFERENCE!>ArrayList<!><R>(this.size), transform)
+}
+
+fun <T, R, C: MutableCollection<in R>> Collection<T>.mapTo(result: C, transform : (T) -> R) : C {
+  for (item in this)
+    result.add(transform(item))
+  return result
+}
+
+fun <T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
+    for (element in this) result.add(element)
+    return result
+}
+
+val Collection<*>.size : Int
+    get() = size