Update dependencies and fix breaking changes in libffi-sys and arcu

Cargo.toml

@@ -38,7 +38,7 @@ to-syn-value_derive = "0.1.1"
 walkdir = "2"
 
 [dependencies]
-arcu = { version = "0.1.1", features = ["thread_local_counter"] }
+arcu = { version = "0.1.2", features = ["thread_local_counter"] }
 base64 = "0.22.1"
 bit-set = "0.8.0"
 bitvec = "1"

src/arena.rs

@@ -86,6 +86,10 @@ pub struct F64Table {
     update: Mutex<()>,
 }
 
+// TODO: Actually prove this, as it's probably unsound right now
+unsafe impl Send for F64Table {}
+unsafe impl Sync for F64Table {}
+
 #[inline(always)]
 pub fn lookup_float(
     offset: F64Offset,

src/ffi.rs

@@ -53,13 +53,23 @@ pub struct ForeignFunctionTable {
     structs: HashMap<String, StructImpl>,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 struct StructImpl {
     ffi_type: ffi_type,
     fields: Vec<*mut ffi_type>,
     atom_fields: Vec<Atom>,
 }
 
+impl std::fmt::Debug for StructImpl {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("StructImpl")
+            .field("ffi_type", &&"<???>")
+            .field("fields", &self.fields)
+            .field("atom_fields", &self.atom_fields)
+            .finish()
+    }
+}
+
 struct PointerArgs {
     pointers: Vec<*mut c_void>,
     _memory: Vec<Box<dyn Any>>,