Added a new opaque type to represent contexts.

com.oracle.truffle.r.native/fficall/src/jni/variables.c

@@ -59,7 +59,7 @@ SEXP FASTR_NamespaceRegistry() {
 	return (*env)->CallStaticObjectMethod(env, CallRFFIHelperClass, getNamespaceRegistryMethodID);
 }
 
-SEXP FASTR_GlobalContext() {
+CTXT FASTR_GlobalContext() {
 	JNIEnv *env = getEnv();
 	return (*env)->CallStaticObjectMethod(env, CallRFFIHelperClass, getGlobalContextMethodID);
 }

com.oracle.truffle.r.native/include/ed_Rinternals

@@ -12,6 +12,7 @@ a
 i
 #ifdef FASTR
 typedef void *SEXP;
+typedef void *CTXT;
 #else
 .
 +1