nullable safe calls supported (for methods and instances)

testData/ast/callChain/file/libraryMethodCall.jav

@@ -0,0 +1,12 @@
+class Library {
+  static void call() {}
+
+  static String getString() { return ""; }
+}
+
+class User {
+  void main() {
+    Library.call();
+    Library.getString().isEmpty();
+  }
+}

testData/ast/callChain/file/libraryMethodCall.kt

@@ -0,0 +1,17 @@
+namespace {
+open class Library {
+class object {
+fun call() : Unit {
+}
+fun getString() : String? {
+return ""
+}
+}
+}
+open class User {
+fun main() : Unit {
+Library.call()
+Library.getString()?.isEmpty()
+}
+}
+}

testData/ast/callChain/file/libraryMethodCallFromInstance.jav

@@ -0,0 +1,16 @@
+class Library {
+  void call() {}
+
+  String getString() { return ""; }
+}
+
+class User {
+  void main() {
+    Library lib = new Library();
+    lib.call();
+    lib.getString().isEmpty();
+
+    new Library().call();
+    new Library().getString().isEmpty();
+  }
+}

testData/ast/callChain/file/libraryMethodCallFromInstance.kt

@@ -0,0 +1,18 @@
+namespace {
+open class Library {
+fun call() : Unit {
+}
+fun getString() : String? {
+return ""
+}
+}
+open class User {
+fun main() : Unit {
+var lib : Library? = Library()
+lib?.call()
+lib?.getString()?.isEmpty()
+Library().call()
+Library().getString()?.isEmpty()
+}
+}
+}

testData/ast/callChain/file/libraryStringFieldCall.jav

@@ -0,0 +1,9 @@
+class Library {
+  final public String myString;
+}
+
+class User {
+  void main() {
+    Library.myString.isEmpty();
+  }
+}

testData/ast/callChain/file/libraryStringFieldCall.kt

@@ -0,0 +1,10 @@
+namespace {
+open class Library {
+public val myString : String?
+}
+open class User {
+fun main() : Unit {
+Library.myString?.isEmpty()
+}
+}
+}