KT-2631 Check multiple assignment - in progress

check multiple declaration without specified type annotation

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

@@ -0,0 +1,20 @@
+package a
+
+class MyClass {
+    fun component0(<!UNUSED_PARAMETER!>i<!>: Int) {}
+}
+
+class MyClass2 {}
+
+<!CONFLICTING_OVERLOADS!>fun MyClass2.component0()<!> = 1.2
+<!CONFLICTING_OVERLOADS!>fun MyClass2.component0()<!> = 1.3
+
+fun test(<!UNUSED_PARAMETER!>mc1<!>: MyClass, <!UNUSED_PARAMETER!>mc2<!>: MyClass2) {
+    val (a, b) = <!COMPONENT_FUNCTION_MISSING, COMPONENT_FUNCTION_MISSING!>mc1<!>
+    val (c) = <!COMPONENT_FUNCTION_AMBIGUITY!>mc2<!>
+
+    //a,b,c are error types
+    a : Boolean
+    b : Boolean
+    c : Boolean
+}