Change rust/upb to only ever do `use super::` rather than `use crate::`

This makes it more 'relocatable' as a module into a monolithic runtime crate.

PiperOrigin-RevId: 655215778

rust/upb/arena.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
+use super::opaque_pointee::opaque_pointee;
 use std::alloc::{self, Layout};
 use std::cell::UnsafeCell;
 use std::marker::PhantomData;

rust/upb/array.rs

@@ -5,8 +5,8 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
-use crate::{upb_MessageValue, upb_MutableMessageValue, CType, RawArena};
+use super::opaque_pointee::opaque_pointee;
+use super::{upb_MessageValue, upb_MutableMessageValue, CType, RawArena};
 use std::ptr::NonNull;
 
 opaque_pointee!(upb_Array);
@@ -27,13 +27,14 @@ extern "C" {
 
 #[cfg(test)]
 mod tests {
+    use super::super::Arena;
     use super::*;
 
     #[test]
     fn array_ffi_test() {
         // SAFETY: FFI unit test uses C API under expected patterns.
         unsafe {
-            let arena = crate::Arena::new();
+            let arena = Arena::new();
             let raw_arena = arena.raw();
             let array = upb_Array_New(raw_arena, CType::Float);
 

rust/upb/extension_registry.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
+use super::opaque_pointee::opaque_pointee;
 use std::ptr::NonNull;
 
 opaque_pointee!(upb_ExtensionRegistry);

rust/upb/map.rs

@@ -5,8 +5,8 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
-use crate::{upb_MessageValue, CType, RawArena};
+use super::opaque_pointee::opaque_pointee;
+use super::{upb_MessageValue, CType, RawArena};
 use std::ptr::NonNull;
 
 opaque_pointee!(upb_Map);
@@ -49,13 +49,14 @@ extern "C" {
 
 #[cfg(test)]
 mod tests {
+    use super::super::Arena;
     use super::*;
 
     #[test]
     fn map_ffi_test() {
         // SAFETY: FFI unit test uses C API under expected patterns.
         unsafe {
-            let arena = crate::Arena::new();
+            let arena = Arena::new();
             let raw_arena = arena.raw();
             let map = upb_Map_New(raw_arena, CType::Bool, CType::Double);
             assert_eq!(upb_Map_Size(map), 0);

rust/upb/message.rs

@@ -5,8 +5,8 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
-use crate::{upb_ExtensionRegistry, upb_MiniTable, upb_MiniTableField, RawArena};
+use super::opaque_pointee::opaque_pointee;
+use super::{upb_ExtensionRegistry, upb_MiniTable, upb_MiniTableField, RawArena};
 use std::ptr::NonNull;
 
 opaque_pointee!(upb_Message);

rust/upb/message_value.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::{RawArray, RawMap, RawMessage, StringView};
+use super::{RawArray, RawMap, RawMessage, StringView};
 
 // Transcribed from google3/third_party/upb/upb/message/value.h
 #[repr(C)]

rust/upb/mini_table.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::opaque_pointee::opaque_pointee;
+use super::opaque_pointee::opaque_pointee;
 use std::ptr::NonNull;
 
 opaque_pointee!(upb_MiniTable);

rust/upb/owned_arena_box.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::Arena;
+use super::Arena;
 use std::fmt::{self, Debug};
 use std::ops::{Deref, DerefMut};
 use std::ptr::NonNull;

rust/upb/text.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::{upb_MiniTable, RawMessage};
+use super::{upb_MiniTable, RawMessage};
 
 extern "C" {
     /// Returns the minimum needed length (excluding NULL) that `buf` has to be

rust/upb/wire.rs

@@ -5,7 +5,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-use crate::{upb_ExtensionRegistry, upb_MiniTable, Arena, RawArena, RawMessage};
+use super::{upb_ExtensionRegistry, upb_MiniTable, Arena, RawArena, RawMessage};
 
 // LINT.IfChange(encode_status)
 #[repr(C)]