diff --git a/example/Abnormals/BuildFailure/kgenprog.toml b/example/Abnormals/BuildFailure01/kgenprog.toml
similarity index 100%
rename from example/Abnormals/BuildFailure/kgenprog.toml
rename to example/Abnormals/BuildFailure01/kgenprog.toml
diff --git a/example/Abnormals/BuildFailure/src/example/CloseToZero.java b/example/Abnormals/BuildFailure01/src/example/CloseToZero.java
similarity index 100%
rename from example/Abnormals/BuildFailure/src/example/CloseToZero.java
rename to example/Abnormals/BuildFailure01/src/example/CloseToZero.java
diff --git a/example/Abnormals/BuildFailure/src/example/CloseToZeroTest.java b/example/Abnormals/BuildFailure01/src/example/CloseToZeroTest.java
similarity index 100%
rename from example/Abnormals/BuildFailure/src/example/CloseToZeroTest.java
rename to example/Abnormals/BuildFailure01/src/example/CloseToZeroTest.java
diff --git a/example/Abnormals/BuildFailure02/kgenprog.toml b/example/Abnormals/BuildFailure02/kgenprog.toml
new file mode 100644
index 000000000..2df10afbb
--- /dev/null
+++ b/example/Abnormals/BuildFailure02/kgenprog.toml
@@ -0,0 +1,4 @@
+root-dir = "./"
+src = ["src/example/CloseToZero.java"]
+test = ["src/example/CloseToZeroTest.java"]
+
diff --git a/example/Abnormals/BuildFailure02/src/example/CloseToZero.java b/example/Abnormals/BuildFailure02/src/example/CloseToZero.java
new file mode 100644
index 000000000..cb5770a4f
--- /dev/null
+++ b/example/Abnormals/BuildFailure02/src/example/CloseToZero.java
@@ -0,0 +1,15 @@
+package example;
+
+public class CloseToZero {
+
+  public int close_to_zero(int n) {
+    if (n == 0) {
+      n++ // build failure
+    } else if (n > 0) {
+      n--;
+    } else {
+      n++;
+    }
+    return n;
+  }
+}
diff --git a/example/Abnormals/BuildFailure02/src/example/CloseToZeroTest.java b/example/Abnormals/BuildFailure02/src/example/CloseToZeroTest.java
new file mode 100644
index 000000000..583670e2a
--- /dev/null
+++ b/example/Abnormals/BuildFailure02/src/example/CloseToZeroTest.java
@@ -0,0 +1,26 @@
+package example;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+public class CloseToZeroTest {
+  @Test
+  public void test01() {
+    assertEquals(9, new CloseToZero().close_to_zero(10));
+  }
+
+  @Test
+  public void test02() {
+    assertEquals(99, new CloseToZero().close_to_zero(100));
+  }
+
+  @Test
+  public void test03() {
+    assertEquals(0, new CloseToZero().close_to_zero(0));
+  }
+
+  @Test
+  public void test04() {
+    assertEquals(-9, new CloseToZero().close_to_zero(-10));
+  }
+}
diff --git a/src/main/java/jp/kusumotolab/kgenprog/ga/variant/VariantStore.java b/src/main/java/jp/kusumotolab/kgenprog/ga/variant/VariantStore.java
index 2441a6d95..a21b91737 100644
--- a/src/main/java/jp/kusumotolab/kgenprog/ga/variant/VariantStore.java
+++ b/src/main/java/jp/kusumotolab/kgenprog/ga/variant/VariantStore.java
@@ -9,6 +9,7 @@
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Consumer;
 import java.util.function.Function;
+
 import io.reactivex.Single;
 import jp.kusumotolab.kgenprog.Configuration;
 import jp.kusumotolab.kgenprog.OrdinalNumber;
@@ -18,7 +19,9 @@
 import jp.kusumotolab.kgenprog.ga.validation.SourceCodeValidation.Input;
 import jp.kusumotolab.kgenprog.project.GeneratedSourceCode;
 import jp.kusumotolab.kgenprog.project.test.EmptyTestResults;
+import jp.kusumotolab.kgenprog.project.test.TestResult;
 import jp.kusumotolab.kgenprog.project.test.TestResults;
+import org.junit.Test;
 
 /**
  * kGenProg が生成する Variant を生成したり保持したりするクラス
@@ -225,9 +228,14 @@ private Variant createVariant(final Gene gene, final GeneratedSourceCode sourceC
         .cast(Variant.class)
         .cache();
 
+    // ASTはあるがビルド＆テスト実行がまだされていない場合 -> ビルド＆テスト実行をする
+    // 以前生成したのと同じソースコードが生成された場合 -> その旨のメッセージを返す
+    // 上記以外の場合 -> 構文エラーが発生した登見なしてメッセージを返す
     final Single<TestResults> resultsSingle =
         sourceCode.shouldBeTested() ? strategies.execAsyncTestExecutor(variantSingle)
-            .cache() : Single.just(new EmptyTestResults("build failed or reproduced."));
+            .cache() : Single.just(new EmptyTestResults(
+            sourceCode.isReproducedSourceCode() ? "reproduced."
+                : sourceCode.getGenerationMessage()));
     variant.setTestResultsSingle(resultsSingle);
 
     final Single<Fitness> fitnessSingle = Single
diff --git a/src/test/java/jp/kusumotolab/kgenprog/KGenProgMainTest.java b/src/test/java/jp/kusumotolab/kgenprog/KGenProgMainTest.java
index 661f63143..d9e261a31 100644
--- a/src/test/java/jp/kusumotolab/kgenprog/KGenProgMainTest.java
+++ b/src/test/java/jp/kusumotolab/kgenprog/KGenProgMainTest.java
@@ -111,14 +111,23 @@ public void testQuickSort01() {
 
 
   @Test
-  public void testBuildFailure() {
-    final Path rootPath = Paths.get("example/Abnormals/BuildFailure");
+  public void testBuildFailure01() {
+    final Path rootPath = Paths.get("example/Abnormals/BuildFailure01");
     final Path productPath = rootPath.resolve(PRODUCT_NAME);
     final Path testPath = rootPath.resolve(TEST_NAME);
 
     final ExitStatus status = runKGenProgMain(rootPath, productPath, testPath);
     assertThat(status).isEqualTo(ExitStatus.FAILURE_INITIAL_BUILD);
+  }
 
+  @Test
+  public void testBuildFailure02() {
+    final Path rootPath = Paths.get("example/Abnormals/BuildFailure02");
+    final Path productPath = rootPath.resolve(PRODUCT_NAME);
+    final Path testPath = rootPath.resolve(TEST_NAME);
+
+    final ExitStatus status = runKGenProgMain(rootPath, productPath, testPath);
+    assertThat(status).isEqualTo(ExitStatus.FAILURE_INITIAL_BUILD);
   }
 
   @Test