Test assignment to catch() variable.

RELNOTES: none
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117841559

core/src/test/java/com/google/errorprone/dataflow/nullnesspropagation/testdata/NullnessPropagationTransferCases8.java

@@ -20,7 +20,7 @@
 import java.io.OutputStream;
 
 /**
- * Tests for caught exceptions.
+ * Tests for {@code try} blocks.
  */
 public class NullnessPropagationTransferCases8 {
   public void caughtException() {
@@ -29,6 +29,10 @@ public void caughtException() {
     } catch (Throwable t) {
       // BUG: Diagnostic contains: (Non-null)
       triggerNullnessChecker(t);
+
+      t = something();
+      // BUG: Diagnostic contains: (Nullable)
+      triggerNullnessChecker(t);
     }
   }
 
@@ -44,7 +48,7 @@ void tryWithResources() throws Exception {
     }
   }
 
-  OutputStream something() {
-    return new ByteArrayOutputStream();
+  <T> T something() {
+    return null;
   }
 }