From 2ac4ed9c483c9a99755644a26119e53d035237dc Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Fri, 27 Jan 2017 14:51:39 +0100
Subject: [PATCH] IDEA-167160 Completion doesn't suggest types for parameters
 in lambdas in Java

---
 .../completion/JavaCompletionContributor.java       |  3 +++
 .../SuggestClassNamesForLambdaParameterTypes.java   | 13 +++++++++++++
 ...gestClassNamesForLambdaParameterTypes_after.java | 13 +++++++++++++
 .../completion/NormalCompletionTest.groovy          |  2 ++
 4 files changed, 31 insertions(+)
 create mode 100644 java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes.java
 create mode 100644 java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes_after.java

diff --git a/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java b/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
index 6121f993f709..be3d41caf03b 100644
--- a/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
+++ b/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
@@ -773,6 +773,9 @@ public class JavaCompletionContributor extends CompletionContributor {
         return true;
       }
     }
+    if (psiElement(PsiIdentifier.class).withParent(psiParameter()).accepts(file.findElementAt(startOffset))) {
+      return true;
+    }
 
     HighlighterIterator iterator = ((EditorEx)editor).getHighlighter().createIterator(startOffset);
     if (iterator.atEnd()) return false;
diff --git a/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes.java b/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes.java
new file mode 100644
index 000000000000..8f917f14497d
--- /dev/null
+++ b/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes.java
@@ -0,0 +1,13 @@
+package abcdef;
+
+import java.util.List;
+
+/**
+ * Created by peter on 1/27/17. ${FFF}
+ */
+public class Foo {
+    void foo() {
+        List<String> strings = null;
+        strings.stream().anyMatch((ChSeq<caret>x) -> x.charAt(0) == 'a');
+    }
+}
diff --git a/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes_after.java b/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes_after.java
new file mode 100644
index 000000000000..e3f93c53eec1
--- /dev/null
+++ b/java/java-tests/testData/codeInsight/completion/normal/SuggestClassNamesForLambdaParameterTypes_after.java
@@ -0,0 +1,13 @@
+package abcdef;
+
+import java.util.List;
+
+/**
+ * Created by peter on 1/27/17. ${FFF}
+ */
+public class Foo {
+    void foo() {
+        List<String> strings = null;
+        strings.stream().anyMatch((CharSequence<caret>x) -> x.charAt(0) == 'a');
+    }
+}
diff --git a/java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy b/java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy
index 477be032ea96..45c6df631011 100644
--- a/java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy
+++ b/java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy
@@ -1743,4 +1743,6 @@ class Bar {
     assert myFixture.lookupElements[0].object == uClass
   }
 
+  void testSuggestClassNamesForLambdaParameterTypes() { doTest('\n') }
+
 }