Tests for redeclarations with multi-decls

compiler/testData/diagnostics/tests/declarationChecks/RedeclarationsInMultiDecl.kt

@@ -0,0 +1,15 @@
+class A {
+    fun component1() : Int = 1
+    fun component2() : Int = 2
+}
+
+fun a() {
+    val (<!REDECLARATION!>a<!>, <!REDECLARATION!>a<!>) = A()
+    val (x, <!REDECLARATION!>y<!>) = A();
+    val <!REDECLARATION!>b<!> = 1
+    use(b)
+    val (<!REDECLARATION!>b<!>, <!REDECLARATION!>y<!>) = A();
+}
+
+
+fun use(a: Any): Any = a