Default to `SourceVersion.latestSupported()` if an unrecognized source version shows up

PiperOrigin-RevId: 483693422

2 files changed, 2 insertions, 4 deletions

diff --git a/java/com/google/turbine/options/LanguageVersion.java b/java/com/google/turbine/options/LanguageVersion.java
index e2b0ea7..d8641b4 100644
--- a/java/com/google/turbine/options/LanguageVersion.java
+++ b/java/com/google/turbine/options/LanguageVersion.java
@@ -53,7 +53,7 @@ public abstract class LanguageVersion {
     try {
       return SourceVersion.valueOf("RELEASE_" + source());
     } catch (IllegalArgumentException unused) {
-      throw new IllegalArgumentException("invalid -source version: " + source());
+      return SourceVersion.latestSupported();
     }
   }
 
diff --git a/javatests/com/google/turbine/options/LanguageVersionTest.java b/javatests/com/google/turbine/options/LanguageVersionTest.java
index 601652c..a5b303d 100644
--- a/javatests/com/google/turbine/options/LanguageVersionTest.java
+++ b/javatests/com/google/turbine/options/LanguageVersionTest.java
@@ -140,8 +140,6 @@ public class LanguageVersionTest {
   public void unsupportedSourceVersion() {
     LanguageVersion languageVersion =
         LanguageVersion.fromJavacopts(ImmutableList.of("-source", "9999"));
-    IllegalArgumentException expected =
-        assertThrows(IllegalArgumentException.class, languageVersion::sourceVersion);
-    assertThat(expected).hasMessageThat().contains("invalid -source version:");
+    assertThat(languageVersion.sourceVersion()).isEqualTo(SourceVersion.latestSupported());
   }
 }