Allow contracts on final non-override members since 1.4

compiler/testData/diagnostics/testsWithStdLib/contracts/smartcasts/contractsOnMembers.fir.kt

@@ -0,0 +1,31 @@
+// !LANGUAGE: +AllowContractsForCustomFunctions +UseReturnsEffect +AllowContractsForNonOverridableMembers
+// !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
+// !DIAGNOSTICS: -INVISIBLE_REFERENCE -INVISIBLE_MEMBER
+
+import kotlin.contracts.*
+
+class Foo {
+    fun myRun(block: () -> Unit) {
+        contract {
+            <!INAPPLICABLE_CANDIDATE!>callsInPlace<!>(block, InvocationKind.EXACTLY_ONCE)
+        }
+        block()
+    }
+
+    fun require(x: Boolean) {
+        contract { returns() implies (x) }
+    }
+}
+
+fun test_1(foo: Foo, x: Any) {
+    foo.require(x is String)
+    x.<!UNRESOLVED_REFERENCE!>length<!>
+}
+
+fun test_2(foo: Foo): Int {
+    val x: Int
+    foo.myRun {
+        x = 1
+    }
+    return x + 1
+}