Replace deprecated APIs and update gradle build configuration (#108)

build.gradle

@@ -115,6 +115,8 @@ task cloneAndBuildDependencies(type: Exec) {
 tasks.withType(JavaCompile) { compilationTask ->
     options.compilerArgs = [
         '-implicit:class',
+        '-Werror',
+        '-Xlint:deprecation',
         '-Awarns',
         '-Xmaxwarns',
         '10000',
@@ -125,6 +127,9 @@ tasks.withType(JavaCompile) { compilationTask ->
     // Enable Error Prone
     options.errorprone.enabled = !isJava8
     options.errorprone.disableWarningsInGeneratedCode = true
+    options.errorprone.errorproneArgs = [
+        '-Xep:VoidUsed:OFF',
+    ]
 }
 
 afterEvaluate {

src/main/java/universe/UniverseInferenceAnnotatedTypeFactory.java

@@ -108,7 +108,7 @@ protected Slot getOrCreateDeclBound(AnnotatedDeclaredType type) {
 
         @Override
         public void handleBinaryTree(AnnotatedTypeMirror atm, BinaryTree binaryTree) {
-            if (atm.isAnnotatedInHierarchy(getVarAnnot())) {
+            if (atm.hasAnnotationInHierarchy(getVarAnnot())) {
                 // Happens for binary trees whose atm is implicitly immutable and already handled by
                 // PICOInferencePropagationTreeAnnotator
                 return;
@@ -135,7 +135,7 @@ public Void visitBinary(BinaryTree node, AnnotatedTypeMirror type) {
         public Void visitTypeCast(TypeCastTree node, AnnotatedTypeMirror type) {
             applyBottomIfImplicitlyBottom(
                     type); // Must run before calling super method to respect existing annotation
-            if (type.isAnnotatedInHierarchy(ANY)) {
+            if (type.hasAnnotationInHierarchy(ANY)) {
                 // VarAnnot is guarenteed to not exist on type, because PropagationTreeAnnotator has
                 // the highest previledge
                 // So VarAnnot hasn't been inserted to cast type yet.