testdata for IDEA-140686

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/diamond/IDEA140686.java

@@ -0,0 +1,50 @@
+package nise;
+
+import java.util.function.BiFunction;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+
+
+
+class TypeTest {
+  public static void main(String[] args) {
+    assertThat(id(new Combiner<>(echo("A"), echo("B"), (str1, str2) ->
+                 new StringBuilder(str1.length() + str2.length())
+                   .append(str1)
+                   .append(str2))).get(),
+               hasSameContentAs("AB"));
+  }
+
+  private static <R> Supplier<R> id(Supplier<R> s) {
+    return s;
+  }
+
+  private static <T> Supplier<T> echo(T s) {
+    return () -> s;
+  }
+
+  private static Predicate<CharSequence> hasSameContentAs(CharSequence seq) {
+    return charSequence -> charSequence.toString().equals(seq.toString());
+  }
+
+  private static <T> void assertThat(T actual, Predicate<? super T> matcher) {
+    if (!matcher.test(actual)) throw new AssertionError();
+  }
+
+  private static class Combiner<T1, T2, R> implements Supplier<R> {
+    private final Supplier<T1> s1;
+    private final Supplier<T2> s2;
+    private final BiFunction<T1, T2, R> f;
+
+    public Combiner(Supplier<T1> s1, Supplier<T2> s2, BiFunction<T1, T2, R> f) {
+      this.s1 = s1;
+      this.s2 = s2;
+      this.f = f;
+    }
+
+    @Override
+    public R get() {
+      return f.apply(s1.get(), s2.get());
+    }
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/Diamond8HighlightingTest.java

@@ -46,6 +46,10 @@ public class Diamond8HighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testWithConstructorRefInside() throws Exception {
     doTest();
   }
+  
+  public void testIDEA140686() throws Exception {
+    doTest();
+  }
 
   private void doTest() throws Exception {
     doTest(BASE_PATH + "/" + getTestName(false) + ".java", false, false);