[java] test case added for IDEA-135847

java/java-tests/testData/psi/parser-partial/expressions/LambdaExpression20.txt

@@ -0,0 +1,30 @@
+PsiJavaFile:LambdaExpression20.java
+  PsiLambdaExpression:(@A T) -> (null)
+    PsiParameterList:(@A T)
+      PsiJavaToken:LPARENTH('(')
+      PsiModifierList:@A
+        PsiAnnotation
+          PsiJavaToken:AT('@')
+          PsiJavaCodeReferenceElement:A
+            PsiIdentifier:A('A')
+            PsiReferenceParameterList
+              <empty list>
+          PsiAnnotationParameterList
+            <empty list>
+      PsiWhiteSpace(' ')
+      PsiTypeElement:T
+        PsiJavaCodeReferenceElement:T
+          PsiIdentifier:T('T')
+          PsiReferenceParameterList
+            <empty list>
+      PsiErrorElement:Identifier expected
+        <empty list>
+      PsiJavaToken:RPARENTH(')')
+    PsiWhiteSpace(' ')
+    PsiJavaToken:ARROW('->')
+    PsiWhiteSpace(' ')
+    PsiParenthesizedExpression:(null)
+      PsiJavaToken:LPARENTH('(')
+      PsiLiteralExpression:null
+        PsiJavaToken:NULL_KEYWORD('null')
+      PsiJavaToken:RPARENTH(')')

java/java-tests/testSrc/com/intellij/lang/java/parser/partial/ExpressionParserTest.java

@@ -146,6 +146,7 @@ public class ExpressionParserTest extends JavaParsingTestCase {
   public void testLambdaExpression17() { doParserTest("(String s -> s"); }
   public void testLambdaExpression18() { doParserTest("(java.lang.String s, -> s"); }
   public void testLambdaExpression19() { doParserTest("(@A T t) -> (null)"); }
+  public void testLambdaExpression20() { doParserTest("(@A T) -> (null)"); }
   public void testAmbiguousLambdaExpression() { doParserTest("f( (x) < y , z > (w) -> v )"); }
 
   private void doParserTest(String text) {