Fixes unused imports in Rust code generator (#8828)

* Fixes unused imports in Rust code generator

* Regenerates generated schemas

tests/monster_test_serialize/my_game/example_2/monster_generated.rs

@@ -1,28 +1,21 @@
 // automatically generated by the FlatBuffers compiler, do not modify
 // @generated
 extern crate alloc;
-extern crate flatbuffers;
-use alloc::boxed::Box;
-use alloc::string::{String, ToString};
-use alloc::vec::Vec;
-use core::mem;
-use core::cmp::Ordering;
 extern crate serde;
 use self::serde::ser::{Serialize, Serializer, SerializeStruct};
-use self::flatbuffers::{EndianScalar, Follow};
 use super::*;
 pub enum MonsterOffset {}
 #[derive(Copy, Clone, PartialEq)]
 
 pub struct Monster<'a> {
-  pub _tab: flatbuffers::Table<'a>,
+  pub _tab: ::flatbuffers::Table<'a>,
 }
 
-impl<'a> flatbuffers::Follow<'a> for Monster<'a> {
+impl<'a> ::flatbuffers::Follow<'a> for Monster<'a> {
   type Inner = Monster<'a>;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    Self { _tab: unsafe { flatbuffers::Table::new(buf, loc) } }
+    Self { _tab: unsafe { ::flatbuffers::Table::new(buf, loc) } }
   }
 }
 
@@ -33,14 +26,14 @@ impl<'a> Monster<'a> {
   }
 
   #[inline]
-  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+  pub unsafe fn init_from_table(table: ::flatbuffers::Table<'a>) -> Self {
     Monster { _tab: table }
   }
   #[allow(unused_mut)]
-  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr, A: flatbuffers::Allocator + 'bldr>(
-    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr, A>,
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr, A: ::flatbuffers::Allocator + 'bldr>(
+    _fbb: &'mut_bldr mut ::flatbuffers::FlatBufferBuilder<'bldr, A>,
     _args: &'args MonsterArgs
-  ) -> flatbuffers::WIPOffset<Monster<'bldr>> {
+  ) -> ::flatbuffers::WIPOffset<Monster<'bldr>> {
     let mut builder = MonsterBuilder::new(_fbb);
     builder.finish()
   }
@@ -51,12 +44,11 @@ impl<'a> Monster<'a> {
   }
 }
 
-impl flatbuffers::Verifiable for Monster<'_> {
+impl ::flatbuffers::Verifiable for Monster<'_> {
   #[inline]
   fn run_verifier(
-    v: &mut flatbuffers::Verifier, pos: usize
-  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
-    use self::flatbuffers::Verifiable;
+    v: &mut ::flatbuffers::Verifier, pos: usize
+  ) -> Result<(), ::flatbuffers::InvalidFlatbuffer> {
     v.visit_table(pos)?
      .finish();
     Ok(())
@@ -82,13 +74,13 @@ impl Serialize for Monster<'_> {
   }
 }
 
-pub struct MonsterBuilder<'a: 'b, 'b, A: flatbuffers::Allocator + 'a> {
-  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a, A>,
-  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+pub struct MonsterBuilder<'a: 'b, 'b, A: ::flatbuffers::Allocator + 'a> {
+  fbb_: &'b mut ::flatbuffers::FlatBufferBuilder<'a, A>,
+  start_: ::flatbuffers::WIPOffset<::flatbuffers::TableUnfinishedWIPOffset>,
 }
-impl<'a: 'b, 'b, A: flatbuffers::Allocator + 'a> MonsterBuilder<'a, 'b, A> {
+impl<'a: 'b, 'b, A: ::flatbuffers::Allocator + 'a> MonsterBuilder<'a, 'b, A> {
   #[inline]
-  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a, A>) -> MonsterBuilder<'a, 'b, A> {
+  pub fn new(_fbb: &'b mut ::flatbuffers::FlatBufferBuilder<'a, A>) -> MonsterBuilder<'a, 'b, A> {
     let start = _fbb.start_table();
     MonsterBuilder {
       fbb_: _fbb,
@@ -96,14 +88,14 @@ impl<'a: 'b, 'b, A: flatbuffers::Allocator + 'a> MonsterBuilder<'a, 'b, A> {
     }
   }
   #[inline]
-  pub fn finish(self) -> flatbuffers::WIPOffset<Monster<'a>> {
+  pub fn finish(self) -> ::flatbuffers::WIPOffset<Monster<'a>> {
     let o = self.fbb_.end_table(self.start_);
-    flatbuffers::WIPOffset::new(o.value())
+    ::flatbuffers::WIPOffset::new(o.value())
   }
 }
 
-impl core::fmt::Debug for Monster<'_> {
-  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+impl ::core::fmt::Debug for Monster<'_> {
+  fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
     let mut ds = f.debug_struct("Monster");
       ds.finish()
   }
@@ -119,10 +111,10 @@ impl Default for MonsterT {
   }
 }
 impl MonsterT {
-  pub fn pack<'b, A: flatbuffers::Allocator + 'b>(
+  pub fn pack<'b, A: ::flatbuffers::Allocator + 'b>(
     &self,
-    _fbb: &mut flatbuffers::FlatBufferBuilder<'b, A>
-  ) -> flatbuffers::WIPOffset<Monster<'b>> {
+    _fbb: &mut ::flatbuffers::FlatBufferBuilder<'b, A>
+  ) -> ::flatbuffers::WIPOffset<Monster<'b>> {
     Monster::create(_fbb, &MonsterArgs{
     })
   }