Refactored tests using Array constructor:

Some moved to tests with stdlib
Some changed to use arrayOfNulls

compiler/testData/codegen/boxWithStdlib/multiDeclForArray/int/MultiDeclForComponentExtensions.kt

@@ -0,0 +1,16 @@
+fun Int.component1() = this + 1
+fun Int.component2() = this + 2
+
+fun doTest(l : Array<Int>): String {
+    var s = ""
+    for ((a, b) in l) {
+      s += "$a:$b;"
+    }
+    return s
+}
+
+fun box(): String {
+  val l = Array<Int>(3, {x -> x})
+  val s = doTest(l)
+  return if (s == "1:2;2:3;3:4;") "OK" else "fail: $s"
+}

compiler/testData/codegen/boxWithStdlib/multiDeclForArray/int/MultiDeclForComponentExtensionsValCaptured.kt

@@ -0,0 +1,16 @@
+fun Int.component1() = this + 1
+fun Int.component2() = this + 2
+
+fun doTest(l : Array<Int>): String {
+    var s = ""
+    for ((a, b) in l) {
+      s += {"$a:$b;"}()
+    }
+    return s
+}
+
+fun box(): String {
+  val l = Array<Int>(3, {x -> x})
+  val s = doTest(l)
+  return if (s == "1:2;2:3;3:4;") "OK" else "fail: $s"
+}

compiler/testData/codegen/boxWithStdlib/multiDeclForArray/int/MultiDeclForComponentMemberExtensions.kt

@@ -0,0 +1,18 @@
+class M {
+  fun Int.component1() = this + 1
+  fun Int.component2() = this + 2
+
+  fun doTest(l : Array<Int>): String {
+      var s = ""
+      for ((a, b) in l) {
+        s += "$a:$b;"
+      }
+      return s
+  }
+}
+
+fun box(): String {
+  val l = Array<Int>(3, {x -> x})
+  val s = M().doTest(l)
+  return if (s == "1:2;2:3;3:4;") "OK" else "fail: $s"
+}

compiler/testData/codegen/boxWithStdlib/multiDeclForArray/int/MultiDeclForComponentMemberExtensionsInExtensionFunction.kt

@@ -0,0 +1,18 @@
+class M {
+  fun Int.component1() = this + 1
+  fun Int.component2() = this + 2
+}
+
+fun M.doTest(l : Array<Int>): String {
+    var s = ""
+    for ((a, b) in l) {
+      s += "$a:$b;"
+    }
+    return s
+}
+
+fun box(): String {
+  val l = Array<Int>(3, {x -> x})
+  val s = M().doTest(l)
+  return if (s == "1:2;2:3;3:4;") "OK" else "fail: $s"
+}