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

compiler/testData/diagnostics/tests/declarationChecks/MultiDeclarationErrors.fir.kt

@@ -0,0 +1,21 @@
+// !WITH_NEW_INFERENCE
+package a
+
+class MyClass {
+    fun component1(i: Int) {}
+}
+
+class MyClass2 {}
+
+fun MyClass2.component1() = 1.2
+fun MyClass2.component1() = 1.3
+
+fun test(mc1: MyClass, mc2: MyClass2) {
+    val (<!INAPPLICABLE_CANDIDATE!>a<!>, <!UNRESOLVED_REFERENCE!>b<!>) = mc1
+    val (c) = mc2
+
+    //a,b,c are error types
+    use(a, b, c)
+}
+
+fun use(vararg a: Any?) = a