java 8 completion: suggest Collectors toList/toSet/toCollection in statement context

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/completion/normal/AllCollectors.java

@@ -0,0 +1,7 @@
+import java.util.*;
+
+class Foo {
+  void m() {
+    Arrays.asList("a", "b").stream().colle<caret>
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/completion/normal/AllCollectors_after.java

@@ -0,0 +1,8 @@
+import java.util.*;
+import java.util.stream.Collectors;
+
+class Foo {
+  void m() {
+    Arrays.asList("a", "b").stream().collect(Collectors.toCollection(<caret>))
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/Normal8CompletionTest.groovy

@@ -217,6 +217,13 @@ class Test88 {
     checkResultByFile(getTestName(false) + "_after.java")
   }
 
+  public void testAllCollectors() {
+    configureByTestName()
+    myFixture.assertPreferredCompletionItems 0, 'collect(Collectors.toCollection())', 'collect', 'collect', 'collect(Collectors.toList())', 'collect(Collectors.toSet())'
+    selectItem(myItems.find { it.lookupString.contains('toCollection') })
+    checkResultByFile(getTestName(false) + "_after.java")
+  }
+
   public void testCollectorsToSet() {
     configureByTestName()
     selectItem(myItems.find { it.lookupString.contains('toSet') })