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

compiler/testData/diagnostics/tests/Underscore.fir.kt

@@ -0,0 +1,46 @@
+// !DIAGNOSTICS: -DEPRECATION -TOPLEVEL_TYPEALIASES_ONLY
+
+import kotlin.Deprecated as ___
+
+@___("") data class Pair(val x: Int, val y: Int)
+
+class _<________>
+val ______ = _<Int>()
+
+fun __(___: Int, y: _<Int>?): Int {
+    val (_, z) = Pair(___ - 1, 42)
+    val (x, __________) = Pair(___ - 1, 42)
+    val ____ = x
+    // in backquotes: allowed
+    val `_` = __________
+
+    val q = fun(_: Int, __: Int) {}
+    q(1, 2)
+
+    val _ = 56
+
+    fun localFun(_: String) = 1
+
+    __@ return if (y != null) __(____, y) else __(`_`, ______)
+}
+
+
+class A1(val _: String)
+class A2(_: String) {
+    class B {
+        typealias _ = CharSequence
+    }
+    val _: Int = 1
+
+    fun _() {}
+
+    fun foo(_: Double) {}
+}
+
+// one underscore parameters for named function are still prohibited
+fun oneUnderscore(_: Int) {}
+
+fun doIt(f: (Any?) -> Any?) = f(null)
+
+val something = doIt { __ -> __ }
+val something2 = doIt { _ -> 1 }