KT-768 Code completion for extension functions

idea/testData/completion/basic/extensions/ExtensionInExtendedClass.kt

@@ -0,0 +1,12 @@
+namespace Test
+
+class Some() {
+    fun methodName() {
+        <caret>
+    }
+}
+
+fun Some.first() {
+}
+
+// EXIST: first

idea/testData/completion/basic/extensions/ExtensionInExtendedClassThis.kt

@@ -0,0 +1,10 @@
+class Some() {
+    fun methodName() {
+        this.<caret>
+    }
+}
+
+fun Some.first() {
+}
+
+// EXIST: first

idea/testData/completion/basic/extensions/ExtensionInExtension.kt

@@ -0,0 +1,11 @@
+fun Some.first() {
+}
+
+class Some() {
+}
+
+fun Some.second() {
+    <caret>
+}
+
+// EXIST: first, second

idea/testData/completion/basic/extensions/ExtensionInExtensionThis.kt

@@ -0,0 +1,11 @@
+fun Some.first() {
+}
+
+class Some() {
+}
+
+fun Some.second() {
+    this.<caret>
+}
+
+// EXIST: first, second

idea/testData/completion/basic/extensions/InvalidTypeParameters.kt

@@ -0,0 +1,17 @@
+class SomeObject<T, U>() {
+    var field : T? = null
+}
+
+class A {}
+class C {}
+
+fun <T: Comparable<T>, U> SomeObject<T, U>.compareTo(other : SomeObject<T, U>) : Int {
+    return 0;
+}
+
+fun some() {
+    val test = SomeObject<A, A>
+    test.<caret>
+}
+
+// ABSENT: compareTo

idea/testData/completion/basic/extensions/IrrelevantExtension.kt

@@ -0,0 +1,11 @@
+fun Some.simpleKotlinExtension() {
+}
+
+class Some() {
+}
+
+fun test() {
+    <caret>
+}
+
+// ABSENT: simpleKotlinExtension

idea/testData/completion/basic/extensions/JavaTypeExtension.kt

@@ -0,0 +1,10 @@
+fun <T> java.lang.Iterable<T>.first() : T? {
+    return this.iterator()?.next()
+}
+
+fun main(args : Array<String>) {
+    val test = java.util.HashSet<Int>()
+    test.<caret>
+}
+
+// EXIST: first

idea/testData/completion/basic/extensions/KotlinGenericTypeExtension.kt

@@ -0,0 +1,12 @@
+fun <T> Some<T>.close() {
+}
+
+class Some<T>() {
+}
+
+fun test() {
+    val s = Some<String>()
+    s.<caret>
+}
+
+// EXIST: close

idea/testData/completion/basic/extensions/KotlinTypeExtension.kt

@@ -0,0 +1,12 @@
+fun Some.simpleKotlinExtension() {
+}
+
+class Some() {
+}
+
+fun test() {
+    val s = Some()
+    s.<caret>
+}
+
+// EXIST: simpleKotlinExtension