Adapt to CF's type argument inference improvements. (#78)

guava/src/com/google/common/io/ByteSource.java

@@ -558,7 +558,11 @@ public boolean isEmpty() throws IOException {
     }
 
     @Override
-    @SuppressWarnings("value:return") // off is at most equal to unslicedSize and length is non-negative
+    @SuppressWarnings({
+        // off is at most equal to unslicedSize and length is non-negative.
+        "value:return",
+        // poly + inference problem.
+        "type.arguments.not.inferred"})
     public Optional<@NonNegative Long> sizeIfKnown() {
       Optional<@NonNegative Long> optionalUnslicedSize = ByteSource.this.sizeIfKnown();
       if (optionalUnslicedSize.isPresent()) {
@@ -708,7 +712,7 @@ public boolean isEmpty() throws IOException {
     }
 
     @Override
-    @SuppressWarnings("value:return") // Long.MAX_VALUE is non-negative
+    @SuppressWarnings("value:type.arguments.not.inferred") // Long.MAX_VALUE is non-negative
     public Optional<@NonNegative Long> sizeIfKnown() {
       if (!(sources instanceof Collection)) {
         // Infinite Iterables can cause problems here. Of course, it's true that most of the other

pom.xml

@@ -15,7 +15,7 @@
     <!-- Override this with -Dtest.include="**/SomeTest.java" on the CLI -->
     <test.include>%regex[.*.class]</test.include>
     <truth.version>1.1.2</truth.version>
-    <checker-framework.version>3.41.0</checker-framework.version>
+    <checker-framework.version>3.43.0-SNAPSHOT</checker-framework.version>
     <animal.sniffer.version>1.20</animal.sniffer.version>
     <maven-javadoc-plugin.version>3.1.0</maven-javadoc-plugin.version>
     <!-- Empty for all JDKs but 9-12 -->
@@ -255,6 +255,14 @@
       <url>scp://dummy.server/dontinstall/usestaging</url>
     </site>
   </distributionManagement>
+  <repositories>
+    <repository>
+      <id>snapshots-repo</id>
+      <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+      <releases><enabled>false</enabled></releases>
+      <snapshots><enabled>true</enabled></snapshots>
+    </repository>
+  </repositories>
   <dependencyManagement>
     <dependencies>
       <dependency>