Comments binding (not complete yet)

compiler/testData/psi/CommentsBinding.kt

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ */
+package foo.bar // package directive
+
+import java.util.* // we need classes from java.util
+import javax.* // and from here too
+
+// other imports
+import a.b
+import c.d
+
+/**
+ * Doc comment for A
+ */
+class A {}
+// after class A
+
+// comment for B 1
+// comment for B 2
+class B {} // end of class B
+
+/* Simple comment */
+class C // no body
+
+class D {
+    // This is v1
+    val v1 = 1 // use 1
+    /** v2 doc comment */
+    val v2 = 2
+
+    // Function foo()
+    fun foo(/* parameters */ p1: Int/* p1 */, p2: Int /* p2 */) {
+    } // end of foo
+
+    // class object
+    class object {
+    } // end of class object
+}
+
+// This is v
+val v = 1 // one
+
+// This is fun
+public fun foo() {
+    val local = 1 // this is local
+    // declare another local
+    val local2 = 2
+} // end
+
+enum class E {
+    A // this is A
+    /** This is B */ B
+    /* And this is C */ C
+    /** This is X */
+    X {
+        override fun toString() = "X"
+    } // end of X
+}
+
+var prop: Int // Int
+  get() = 1 // this is getter
+  set(value) {} // this is setter
+
+val prop2: Int get = 1 // prop2