guava type migration: fix stack overflow when lambda implements guava & java function EA-92353

java/typeMigration/src/com/intellij/refactoring/typeMigration/rules/guava/GuavaLambda.java

@@ -69,6 +69,9 @@ public enum GuavaLambda {
     if (aClass == null) return null;
     for (GuavaLambda lambda : values()) {
       if (InheritanceUtil.isInheritor(aClass, lambda.getClassQName())) {
+        if (PREDICATE != lambda && InheritanceUtil.isInheritor(aClass, lambda.getJavaAnalogueClassQName())) {
+          return null;
+        }
         return lambda;
       }
     }

java/typeMigration/test/com/intellij/codeInsight/inspections/GuavaInspectionTest.java

@@ -293,6 +293,10 @@ public class GuavaInspectionTest extends JavaCodeInsightFixtureTestCase {
     doTest();
   }
 
+  public void testLambdaImplementsBothInterfaces() {
+    doTest();
+  }
+
   private void doTestNoQuickFixes(Class<? extends PsiElement>... highlightedElements) {
     myFixture.configureByFile(getTestName(true) + ".java");
 

java/typeMigration/testData/inspections/guava/lambdaImplementsBothInterfaces.java

@@ -0,0 +1,23 @@
+import com.google.common.collect.FluentIterable;
+
+import java.util.Set;
+
+class Test {
+  public interface HasCode {
+    String getCode();
+  }
+
+  public enum GetCode implements com.google.common.base.Function<HasCode, String>, java.util.function.Function<HasCode, String> {
+    FUNC;
+
+    @Override
+    public String apply(HasCode e) {
+      return e.getCode();
+    }
+
+  }
+
+  public Set<String> getRegionCodeList(Set<HasCode> regions) {
+    return FluentIterable.f<caret>rom(regions).transform(GetCode.FUNC::apply).toSet();
+  }
+}

java/typeMigration/testData/inspections/guava/lambdaImplementsBothInterfaces_after.java

@@ -0,0 +1,24 @@
+import com.google.common.base.Function;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+class Test {
+  public interface HasCode {
+    String getCode();
+  }
+
+  public enum GetCode implements Function<HasCode, String>, java.util.function.Function<HasCode, String> {
+    FUNC;
+
+    @Override
+    public String apply(HasCode e) {
+      return e.getCode();
+    }
+
+  }
+
+  public Set<String> getRegionCodeList(Set<HasCode> regions) {
+    return regions.stream().map(GetCode.FUNC).collect(Collectors.toSet());
+  }
+}