fix(rust): fixed rust namer isses, resolve #7865 and ##7782 (#7964)

Co-authored-by: Derek Bailey <derekbailey@google.com>

scripts/generate_code.py

@@ -339,6 +339,12 @@ flatc(
     schema="arrays_test.fbs",
 )
 
+flatc(
+    RUST_OPTS,
+    prefix="rust_namer_test",
+    schema="rust_namer_test.fbs",
+)
+
 flatc(
     BASE_OPTS + PYTHON_OPTS,
     schema="arrays_test.fbs",

src/idl_namer.h

@@ -146,7 +146,8 @@ class IdlNamer : public Namer {
 
   std::string LegacyRustUnionTypeMethod(const FieldDef &d) {
     // assert d is a union
-    return Method(d.name + "_type");
+    // d should convert case but not escape keywords due to historical reasons
+    return ConvertCase(d.name, config_.fields, Case::kLowerCamel) + "_type";
   }
 
  private:

tests/rust_namer_test.fbs

@@ -0,0 +1,27 @@
+namespace RustNamerTest;
+
+table FieldTable {}
+
+union FieldUnion {
+  f :FieldTable (id: 0),
+}
+
+table RootTable {
+  field42 :FieldUnion (id: 1);
+}
+
+table PlayerStatEvent {}
+table PlayerSpectate {}
+table PlayerInputChange {}
+
+union GameMessage
+{
+    PlayerStatEvent,
+    PlayerSpectate,
+	PlayerInputChange
+}
+
+table GameMessageWrapper
+{
+	Message:GameMessage;
+}

tests/rust_namer_test/mod.rs

@@ -0,0 +1,21 @@
+// Automatically generated by the Flatbuffers compiler. Do not modify.
+// @generated
+pub mod rust_namer_test {
+  use super::*;
+  mod field_union_generated;
+  pub use self::field_union_generated::*;
+  mod game_message_generated;
+  pub use self::game_message_generated::*;
+  mod field_table_generated;
+  pub use self::field_table_generated::*;
+  mod root_table_generated;
+  pub use self::root_table_generated::*;
+  mod player_stat_event_generated;
+  pub use self::player_stat_event_generated::*;
+  mod player_spectate_generated;
+  pub use self::player_spectate_generated::*;
+  mod player_input_change_generated;
+  pub use self::player_input_change_generated::*;
+  mod game_message_wrapper_generated;
+  pub use self::game_message_wrapper_generated::*;
+} // rust_namer_test

tests/rust_namer_test/rust_namer_test/field_table_generated.rs

@@ -0,0 +1,117 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum FieldTableOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct FieldTable<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for FieldTable<'a> {
+  type Inner = FieldTable<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> FieldTable<'a> {
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.FieldTable"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    FieldTable { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    _args: &'args FieldTableArgs
+  ) -> flatbuffers::WIPOffset<FieldTable<'bldr>> {
+    let mut builder = FieldTableBuilder::new(_fbb);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> FieldTableT {
+    FieldTableT {
+    }
+  }
+}
+
+impl flatbuffers::Verifiable for FieldTable<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .finish();
+    Ok(())
+  }
+}
+pub struct FieldTableArgs {
+}
+impl<'a> Default for FieldTableArgs {
+  #[inline]
+  fn default() -> Self {
+    FieldTableArgs {
+    }
+  }
+}
+
+pub struct FieldTableBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> FieldTableBuilder<'a, 'b> {
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> FieldTableBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    FieldTableBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<FieldTable<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for FieldTable<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("FieldTable");
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct FieldTableT {
+}
+impl Default for FieldTableT {
+  fn default() -> Self {
+    Self {
+    }
+  }
+}
+impl FieldTableT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<FieldTable<'b>> {
+    FieldTable::create(_fbb, &FieldTableArgs{
+    })
+  }
+}

tests/rust_namer_test/rust_namer_test/field_union_generated.rs

@@ -0,0 +1,145 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+pub const ENUM_MIN_FIELD_UNION: u8 = 0;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+pub const ENUM_MAX_FIELD_UNION: u8 = 1;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+#[allow(non_camel_case_types)]
+pub const ENUM_VALUES_FIELD_UNION: [FieldUnion; 2] = [
+  FieldUnion::NONE,
+  FieldUnion::f,
+];
+
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+#[repr(transparent)]
+pub struct FieldUnion(pub u8);
+#[allow(non_upper_case_globals)]
+impl FieldUnion {
+  pub const NONE: Self = Self(0);
+  pub const f: Self = Self(1);
+
+  pub const ENUM_MIN: u8 = 0;
+  pub const ENUM_MAX: u8 = 1;
+  pub const ENUM_VALUES: &'static [Self] = &[
+    Self::NONE,
+    Self::f,
+  ];
+  /// Returns the variant's name or "" if unknown.
+  pub fn variant_name(self) -> Option<&'static str> {
+    match self {
+      Self::NONE => Some("NONE"),
+      Self::f => Some("f"),
+      _ => None,
+    }
+  }
+}
+impl core::fmt::Debug for FieldUnion {
+  fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+    if let Some(name) = self.variant_name() {
+      f.write_str(name)
+    } else {
+      f.write_fmt(format_args!("<UNKNOWN {:?}>", self.0))
+    }
+  }
+}
+impl<'a> flatbuffers::Follow<'a> for FieldUnion {
+  type Inner = Self;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    let b = flatbuffers::read_scalar_at::<u8>(buf, loc);
+    Self(b)
+  }
+}
+
+impl flatbuffers::Push for FieldUnion {
+    type Output = FieldUnion;
+    #[inline]
+    unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
+        flatbuffers::emplace_scalar::<u8>(dst, self.0);
+    }
+}
+
+impl flatbuffers::EndianScalar for FieldUnion {
+  type Scalar = u8;
+  #[inline]
+  fn to_little_endian(self) -> u8 {
+    self.0.to_le()
+  }
+  #[inline]
+  #[allow(clippy::wrong_self_convention)]
+  fn from_little_endian(v: u8) -> Self {
+    let b = u8::from_le(v);
+    Self(b)
+  }
+}
+
+impl<'a> flatbuffers::Verifiable for FieldUnion {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    u8::run_verifier(v, pos)
+  }
+}
+
+impl flatbuffers::SimpleToVerifyInSlice for FieldUnion {}
+pub struct FieldUnionUnionTableOffset {}
+
+#[allow(clippy::upper_case_acronyms)]
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub enum FieldUnionT {
+  NONE,
+  F(Box<FieldTableT>),
+}
+impl Default for FieldUnionT {
+  fn default() -> Self {
+    Self::NONE
+  }
+}
+impl FieldUnionT {
+  pub fn field_union_type(&self) -> FieldUnion {
+    match self {
+      Self::NONE => FieldUnion::NONE,
+      Self::F(_) => FieldUnion::f,
+    }
+  }
+  pub fn pack(&self, fbb: &mut flatbuffers::FlatBufferBuilder) -> Option<flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>> {
+    match self {
+      Self::NONE => None,
+      Self::F(v) => Some(v.pack(fbb).as_union_value()),
+    }
+  }
+  /// If the union variant matches, return the owned FieldTableT, setting the union to NONE.
+  pub fn take_f(&mut self) -> Option<Box<FieldTableT>> {
+    if let Self::F(_) = self {
+      let v = core::mem::replace(self, Self::NONE);
+      if let Self::F(w) = v {
+        Some(w)
+      } else {
+        unreachable!()
+      }
+    } else {
+      None
+    }
+  }
+  /// If the union variant matches, return a reference to the FieldTableT.
+  pub fn as_f(&self) -> Option<&FieldTableT> {
+    if let Self::F(v) = self { Some(v.as_ref()) } else { None }
+  }
+  /// If the union variant matches, return a mutable reference to the FieldTableT.
+  pub fn as_f_mut(&mut self) -> Option<&mut FieldTableT> {
+    if let Self::F(v) = self { Some(v.as_mut()) } else { None }
+  }
+}

tests/rust_namer_test/rust_namer_test/game_message_generated.rs

@@ -0,0 +1,201 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+pub const ENUM_MIN_GAME_MESSAGE: u8 = 0;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+pub const ENUM_MAX_GAME_MESSAGE: u8 = 3;
+#[deprecated(since = "2.0.0", note = "Use associated constants instead. This will no longer be generated in 2021.")]
+#[allow(non_camel_case_types)]
+pub const ENUM_VALUES_GAME_MESSAGE: [GameMessage; 4] = [
+  GameMessage::NONE,
+  GameMessage::PlayerStatEvent,
+  GameMessage::PlayerSpectate,
+  GameMessage::PlayerInputChange,
+];
+
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+#[repr(transparent)]
+pub struct GameMessage(pub u8);
+#[allow(non_upper_case_globals)]
+impl GameMessage {
+  pub const NONE: Self = Self(0);
+  pub const PlayerStatEvent: Self = Self(1);
+  pub const PlayerSpectate: Self = Self(2);
+  pub const PlayerInputChange: Self = Self(3);
+
+  pub const ENUM_MIN: u8 = 0;
+  pub const ENUM_MAX: u8 = 3;
+  pub const ENUM_VALUES: &'static [Self] = &[
+    Self::NONE,
+    Self::PlayerStatEvent,
+    Self::PlayerSpectate,
+    Self::PlayerInputChange,
+  ];
+  /// Returns the variant's name or "" if unknown.
+  pub fn variant_name(self) -> Option<&'static str> {
+    match self {
+      Self::NONE => Some("NONE"),
+      Self::PlayerStatEvent => Some("PlayerStatEvent"),
+      Self::PlayerSpectate => Some("PlayerSpectate"),
+      Self::PlayerInputChange => Some("PlayerInputChange"),
+      _ => None,
+    }
+  }
+}
+impl core::fmt::Debug for GameMessage {
+  fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+    if let Some(name) = self.variant_name() {
+      f.write_str(name)
+    } else {
+      f.write_fmt(format_args!("<UNKNOWN {:?}>", self.0))
+    }
+  }
+}
+impl<'a> flatbuffers::Follow<'a> for GameMessage {
+  type Inner = Self;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    let b = flatbuffers::read_scalar_at::<u8>(buf, loc);
+    Self(b)
+  }
+}
+
+impl flatbuffers::Push for GameMessage {
+    type Output = GameMessage;
+    #[inline]
+    unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
+        flatbuffers::emplace_scalar::<u8>(dst, self.0);
+    }
+}
+
+impl flatbuffers::EndianScalar for GameMessage {
+  type Scalar = u8;
+  #[inline]
+  fn to_little_endian(self) -> u8 {
+    self.0.to_le()
+  }
+  #[inline]
+  #[allow(clippy::wrong_self_convention)]
+  fn from_little_endian(v: u8) -> Self {
+    let b = u8::from_le(v);
+    Self(b)
+  }
+}
+
+impl<'a> flatbuffers::Verifiable for GameMessage {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    u8::run_verifier(v, pos)
+  }
+}
+
+impl flatbuffers::SimpleToVerifyInSlice for GameMessage {}
+pub struct GameMessageUnionTableOffset {}
+
+#[allow(clippy::upper_case_acronyms)]
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub enum GameMessageT {
+  NONE,
+  PlayerStatEvent(Box<PlayerStatEventT>),
+  PlayerSpectate(Box<PlayerSpectateT>),
+  PlayerInputChange(Box<PlayerInputChangeT>),
+}
+impl Default for GameMessageT {
+  fn default() -> Self {
+    Self::NONE
+  }
+}
+impl GameMessageT {
+  pub fn game_message_type(&self) -> GameMessage {
+    match self {
+      Self::NONE => GameMessage::NONE,
+      Self::PlayerStatEvent(_) => GameMessage::PlayerStatEvent,
+      Self::PlayerSpectate(_) => GameMessage::PlayerSpectate,
+      Self::PlayerInputChange(_) => GameMessage::PlayerInputChange,
+    }
+  }
+  pub fn pack(&self, fbb: &mut flatbuffers::FlatBufferBuilder) -> Option<flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>> {
+    match self {
+      Self::NONE => None,
+      Self::PlayerStatEvent(v) => Some(v.pack(fbb).as_union_value()),
+      Self::PlayerSpectate(v) => Some(v.pack(fbb).as_union_value()),
+      Self::PlayerInputChange(v) => Some(v.pack(fbb).as_union_value()),
+    }
+  }
+  /// If the union variant matches, return the owned PlayerStatEventT, setting the union to NONE.
+  pub fn take_player_stat_event(&mut self) -> Option<Box<PlayerStatEventT>> {
+    if let Self::PlayerStatEvent(_) = self {
+      let v = core::mem::replace(self, Self::NONE);
+      if let Self::PlayerStatEvent(w) = v {
+        Some(w)
+      } else {
+        unreachable!()
+      }
+    } else {
+      None
+    }
+  }
+  /// If the union variant matches, return a reference to the PlayerStatEventT.
+  pub fn as_player_stat_event(&self) -> Option<&PlayerStatEventT> {
+    if let Self::PlayerStatEvent(v) = self { Some(v.as_ref()) } else { None }
+  }
+  /// If the union variant matches, return a mutable reference to the PlayerStatEventT.
+  pub fn as_player_stat_event_mut(&mut self) -> Option<&mut PlayerStatEventT> {
+    if let Self::PlayerStatEvent(v) = self { Some(v.as_mut()) } else { None }
+  }
+  /// If the union variant matches, return the owned PlayerSpectateT, setting the union to NONE.
+  pub fn take_player_spectate(&mut self) -> Option<Box<PlayerSpectateT>> {
+    if let Self::PlayerSpectate(_) = self {
+      let v = core::mem::replace(self, Self::NONE);
+      if let Self::PlayerSpectate(w) = v {
+        Some(w)
+      } else {
+        unreachable!()
+      }
+    } else {
+      None
+    }
+  }
+  /// If the union variant matches, return a reference to the PlayerSpectateT.
+  pub fn as_player_spectate(&self) -> Option<&PlayerSpectateT> {
+    if let Self::PlayerSpectate(v) = self { Some(v.as_ref()) } else { None }
+  }
+  /// If the union variant matches, return a mutable reference to the PlayerSpectateT.
+  pub fn as_player_spectate_mut(&mut self) -> Option<&mut PlayerSpectateT> {
+    if let Self::PlayerSpectate(v) = self { Some(v.as_mut()) } else { None }
+  }
+  /// If the union variant matches, return the owned PlayerInputChangeT, setting the union to NONE.
+  pub fn take_player_input_change(&mut self) -> Option<Box<PlayerInputChangeT>> {
+    if let Self::PlayerInputChange(_) = self {
+      let v = core::mem::replace(self, Self::NONE);
+      if let Self::PlayerInputChange(w) = v {
+        Some(w)
+      } else {
+        unreachable!()
+      }
+    } else {
+      None
+    }
+  }
+  /// If the union variant matches, return a reference to the PlayerInputChangeT.
+  pub fn as_player_input_change(&self) -> Option<&PlayerInputChangeT> {
+    if let Self::PlayerInputChange(v) = self { Some(v.as_ref()) } else { None }
+  }
+  /// If the union variant matches, return a mutable reference to the PlayerInputChangeT.
+  pub fn as_player_input_change_mut(&mut self) -> Option<&mut PlayerInputChangeT> {
+    if let Self::PlayerInputChange(v) = self { Some(v.as_mut()) } else { None }
+  }
+}

tests/rust_namer_test/rust_namer_test/game_message_wrapper_generated.rs

@@ -0,0 +1,255 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum GameMessageWrapperOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct GameMessageWrapper<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for GameMessageWrapper<'a> {
+  type Inner = GameMessageWrapper<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> GameMessageWrapper<'a> {
+  pub const VT_MESSAGE_TYPE: flatbuffers::VOffsetT = 4;
+  pub const VT_MESSAGE: flatbuffers::VOffsetT = 6;
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.GameMessageWrapper"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    GameMessageWrapper { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    args: &'args GameMessageWrapperArgs
+  ) -> flatbuffers::WIPOffset<GameMessageWrapper<'bldr>> {
+    let mut builder = GameMessageWrapperBuilder::new(_fbb);
+    if let Some(x) = args.Message { builder.add_Message(x); }
+    builder.add_Message_type(args.Message_type);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> GameMessageWrapperT {
+    let Message = match self.Message_type() {
+      GameMessage::NONE => GameMessageT::NONE,
+      GameMessage::PlayerStatEvent => GameMessageT::PlayerStatEvent(Box::new(
+        self.Message_as_player_stat_event()
+            .expect("Invalid union table, expected `GameMessage::PlayerStatEvent`.")
+            .unpack()
+      )),
+      GameMessage::PlayerSpectate => GameMessageT::PlayerSpectate(Box::new(
+        self.Message_as_player_spectate()
+            .expect("Invalid union table, expected `GameMessage::PlayerSpectate`.")
+            .unpack()
+      )),
+      GameMessage::PlayerInputChange => GameMessageT::PlayerInputChange(Box::new(
+        self.Message_as_player_input_change()
+            .expect("Invalid union table, expected `GameMessage::PlayerInputChange`.")
+            .unpack()
+      )),
+      _ => GameMessageT::NONE,
+    };
+    GameMessageWrapperT {
+      Message,
+    }
+  }
+
+  #[inline]
+  pub fn Message_type(&self) -> GameMessage {
+    // Safety:
+    // Created from valid Table for this object
+    // which contains a valid value in this slot
+    unsafe { self._tab.get::<GameMessage>(GameMessageWrapper::VT_MESSAGE_TYPE, Some(GameMessage::NONE)).unwrap()}
+  }
+  #[inline]
+  pub fn Message(&self) -> Option<flatbuffers::Table<'a>> {
+    // Safety:
+    // Created from valid Table for this object
+    // which contains a valid value in this slot
+    unsafe { self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Table<'a>>>(GameMessageWrapper::VT_MESSAGE, None)}
+  }
+  #[inline]
+  #[allow(non_snake_case)]
+  pub fn Message_as_player_stat_event(&self) -> Option<PlayerStatEvent<'a>> {
+    if self.Message_type() == GameMessage::PlayerStatEvent {
+      self.Message().map(|t| {
+       // Safety:
+       // Created from a valid Table for this object
+       // Which contains a valid union in this slot
+       unsafe { PlayerStatEvent::init_from_table(t) }
+     })
+    } else {
+      None
+    }
+  }
+
+  #[inline]
+  #[allow(non_snake_case)]
+  pub fn Message_as_player_spectate(&self) -> Option<PlayerSpectate<'a>> {
+    if self.Message_type() == GameMessage::PlayerSpectate {
+      self.Message().map(|t| {
+       // Safety:
+       // Created from a valid Table for this object
+       // Which contains a valid union in this slot
+       unsafe { PlayerSpectate::init_from_table(t) }
+     })
+    } else {
+      None
+    }
+  }
+
+  #[inline]
+  #[allow(non_snake_case)]
+  pub fn Message_as_player_input_change(&self) -> Option<PlayerInputChange<'a>> {
+    if self.Message_type() == GameMessage::PlayerInputChange {
+      self.Message().map(|t| {
+       // Safety:
+       // Created from a valid Table for this object
+       // Which contains a valid union in this slot
+       unsafe { PlayerInputChange::init_from_table(t) }
+     })
+    } else {
+      None
+    }
+  }
+
+}
+
+impl flatbuffers::Verifiable for GameMessageWrapper<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .visit_union::<GameMessage, _>("Message_type", Self::VT_MESSAGE_TYPE, "Message", Self::VT_MESSAGE, false, |key, v, pos| {
+        match key {
+          GameMessage::PlayerStatEvent => v.verify_union_variant::<flatbuffers::ForwardsUOffset<PlayerStatEvent>>("GameMessage::PlayerStatEvent", pos),
+          GameMessage::PlayerSpectate => v.verify_union_variant::<flatbuffers::ForwardsUOffset<PlayerSpectate>>("GameMessage::PlayerSpectate", pos),
+          GameMessage::PlayerInputChange => v.verify_union_variant::<flatbuffers::ForwardsUOffset<PlayerInputChange>>("GameMessage::PlayerInputChange", pos),
+          _ => Ok(()),
+        }
+     })?
+     .finish();
+    Ok(())
+  }
+}
+pub struct GameMessageWrapperArgs {
+    pub Message_type: GameMessage,
+    pub Message: Option<flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>>,
+}
+impl<'a> Default for GameMessageWrapperArgs {
+  #[inline]
+  fn default() -> Self {
+    GameMessageWrapperArgs {
+      Message_type: GameMessage::NONE,
+      Message: None,
+    }
+  }
+}
+
+pub struct GameMessageWrapperBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> GameMessageWrapperBuilder<'a, 'b> {
+  #[inline]
+  pub fn add_Message_type(&mut self, Message_type: GameMessage) {
+    self.fbb_.push_slot::<GameMessage>(GameMessageWrapper::VT_MESSAGE_TYPE, Message_type, GameMessage::NONE);
+  }
+  #[inline]
+  pub fn add_Message(&mut self, Message: flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>) {
+    self.fbb_.push_slot_always::<flatbuffers::WIPOffset<_>>(GameMessageWrapper::VT_MESSAGE, Message);
+  }
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> GameMessageWrapperBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    GameMessageWrapperBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<GameMessageWrapper<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for GameMessageWrapper<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("GameMessageWrapper");
+      ds.field("Message_type", &self.Message_type());
+      match self.Message_type() {
+        GameMessage::PlayerStatEvent => {
+          if let Some(x) = self.Message_as_player_stat_event() {
+            ds.field("Message", &x)
+          } else {
+            ds.field("Message", &"InvalidFlatbuffer: Union discriminant does not match value.")
+          }
+        },
+        GameMessage::PlayerSpectate => {
+          if let Some(x) = self.Message_as_player_spectate() {
+            ds.field("Message", &x)
+          } else {
+            ds.field("Message", &"InvalidFlatbuffer: Union discriminant does not match value.")
+          }
+        },
+        GameMessage::PlayerInputChange => {
+          if let Some(x) = self.Message_as_player_input_change() {
+            ds.field("Message", &x)
+          } else {
+            ds.field("Message", &"InvalidFlatbuffer: Union discriminant does not match value.")
+          }
+        },
+        _ => {
+          let x: Option<()> = None;
+          ds.field("Message", &x)
+        },
+      };
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct GameMessageWrapperT {
+  pub Message: GameMessageT,
+}
+impl Default for GameMessageWrapperT {
+  fn default() -> Self {
+    Self {
+      Message: GameMessageT::NONE,
+    }
+  }
+}
+impl GameMessageWrapperT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<GameMessageWrapper<'b>> {
+    let Message_type = self.Message.game_message_type();
+    let Message = self.Message.pack(_fbb);
+    GameMessageWrapper::create(_fbb, &GameMessageWrapperArgs{
+      Message_type,
+      Message,
+    })
+  }
+}

tests/rust_namer_test/rust_namer_test/player_input_change_generated.rs

@@ -0,0 +1,117 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum PlayerInputChangeOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct PlayerInputChange<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for PlayerInputChange<'a> {
+  type Inner = PlayerInputChange<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> PlayerInputChange<'a> {
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.PlayerInputChange"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    PlayerInputChange { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    _args: &'args PlayerInputChangeArgs
+  ) -> flatbuffers::WIPOffset<PlayerInputChange<'bldr>> {
+    let mut builder = PlayerInputChangeBuilder::new(_fbb);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> PlayerInputChangeT {
+    PlayerInputChangeT {
+    }
+  }
+}
+
+impl flatbuffers::Verifiable for PlayerInputChange<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .finish();
+    Ok(())
+  }
+}
+pub struct PlayerInputChangeArgs {
+}
+impl<'a> Default for PlayerInputChangeArgs {
+  #[inline]
+  fn default() -> Self {
+    PlayerInputChangeArgs {
+    }
+  }
+}
+
+pub struct PlayerInputChangeBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> PlayerInputChangeBuilder<'a, 'b> {
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> PlayerInputChangeBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    PlayerInputChangeBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<PlayerInputChange<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for PlayerInputChange<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("PlayerInputChange");
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct PlayerInputChangeT {
+}
+impl Default for PlayerInputChangeT {
+  fn default() -> Self {
+    Self {
+    }
+  }
+}
+impl PlayerInputChangeT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<PlayerInputChange<'b>> {
+    PlayerInputChange::create(_fbb, &PlayerInputChangeArgs{
+    })
+  }
+}

tests/rust_namer_test/rust_namer_test/player_spectate_generated.rs

@@ -0,0 +1,117 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum PlayerSpectateOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct PlayerSpectate<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for PlayerSpectate<'a> {
+  type Inner = PlayerSpectate<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> PlayerSpectate<'a> {
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.PlayerSpectate"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    PlayerSpectate { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    _args: &'args PlayerSpectateArgs
+  ) -> flatbuffers::WIPOffset<PlayerSpectate<'bldr>> {
+    let mut builder = PlayerSpectateBuilder::new(_fbb);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> PlayerSpectateT {
+    PlayerSpectateT {
+    }
+  }
+}
+
+impl flatbuffers::Verifiable for PlayerSpectate<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .finish();
+    Ok(())
+  }
+}
+pub struct PlayerSpectateArgs {
+}
+impl<'a> Default for PlayerSpectateArgs {
+  #[inline]
+  fn default() -> Self {
+    PlayerSpectateArgs {
+    }
+  }
+}
+
+pub struct PlayerSpectateBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> PlayerSpectateBuilder<'a, 'b> {
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> PlayerSpectateBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    PlayerSpectateBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<PlayerSpectate<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for PlayerSpectate<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("PlayerSpectate");
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct PlayerSpectateT {
+}
+impl Default for PlayerSpectateT {
+  fn default() -> Self {
+    Self {
+    }
+  }
+}
+impl PlayerSpectateT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<PlayerSpectate<'b>> {
+    PlayerSpectate::create(_fbb, &PlayerSpectateArgs{
+    })
+  }
+}

tests/rust_namer_test/rust_namer_test/player_stat_event_generated.rs

@@ -0,0 +1,117 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum PlayerStatEventOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct PlayerStatEvent<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for PlayerStatEvent<'a> {
+  type Inner = PlayerStatEvent<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> PlayerStatEvent<'a> {
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.PlayerStatEvent"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    PlayerStatEvent { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    _args: &'args PlayerStatEventArgs
+  ) -> flatbuffers::WIPOffset<PlayerStatEvent<'bldr>> {
+    let mut builder = PlayerStatEventBuilder::new(_fbb);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> PlayerStatEventT {
+    PlayerStatEventT {
+    }
+  }
+}
+
+impl flatbuffers::Verifiable for PlayerStatEvent<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .finish();
+    Ok(())
+  }
+}
+pub struct PlayerStatEventArgs {
+}
+impl<'a> Default for PlayerStatEventArgs {
+  #[inline]
+  fn default() -> Self {
+    PlayerStatEventArgs {
+    }
+  }
+}
+
+pub struct PlayerStatEventBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> PlayerStatEventBuilder<'a, 'b> {
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> PlayerStatEventBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    PlayerStatEventBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<PlayerStatEvent<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for PlayerStatEvent<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("PlayerStatEvent");
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct PlayerStatEventT {
+}
+impl Default for PlayerStatEventT {
+  fn default() -> Self {
+    Self {
+    }
+  }
+}
+impl PlayerStatEventT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<PlayerStatEvent<'b>> {
+    PlayerStatEvent::create(_fbb, &PlayerStatEventArgs{
+    })
+  }
+}

tests/rust_namer_test/rust_namer_test/root_table_generated.rs

@@ -0,0 +1,199 @@
+// 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;
+use self::flatbuffers::{EndianScalar, Follow};
+use super::*;
+pub enum RootTableOffset {}
+#[derive(Copy, Clone, PartialEq)]
+
+pub struct RootTable<'a> {
+  pub _tab: flatbuffers::Table<'a>,
+}
+
+impl<'a> flatbuffers::Follow<'a> for RootTable<'a> {
+  type Inner = RootTable<'a>;
+  #[inline]
+  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+    Self { _tab: flatbuffers::Table::new(buf, loc) }
+  }
+}
+
+impl<'a> RootTable<'a> {
+  pub const VT_FIELD42_TYPE: flatbuffers::VOffsetT = 4;
+  pub const VT_FIELD42: flatbuffers::VOffsetT = 6;
+
+  pub const fn get_fully_qualified_name() -> &'static str {
+    "RustNamerTest.RootTable"
+  }
+
+  #[inline]
+  pub unsafe fn init_from_table(table: flatbuffers::Table<'a>) -> Self {
+    RootTable { _tab: table }
+  }
+  #[allow(unused_mut)]
+  pub fn create<'bldr: 'args, 'args: 'mut_bldr, 'mut_bldr>(
+    _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
+    args: &'args RootTableArgs
+  ) -> flatbuffers::WIPOffset<RootTable<'bldr>> {
+    let mut builder = RootTableBuilder::new(_fbb);
+    if let Some(x) = args.field42 { builder.add_field42(x); }
+    builder.add_field42_type(args.field42_type);
+    builder.finish()
+  }
+
+  pub fn unpack(&self) -> RootTableT {
+    let field42 = match self.field42_type() {
+      FieldUnion::NONE => FieldUnionT::NONE,
+      FieldUnion::f => FieldUnionT::F(Box::new(
+        self.field42_as_f()
+            .expect("Invalid union table, expected `FieldUnion::f`.")
+            .unpack()
+      )),
+      _ => FieldUnionT::NONE,
+    };
+    RootTableT {
+      field42,
+    }
+  }
+
+  #[inline]
+  pub fn field42_type(&self) -> FieldUnion {
+    // Safety:
+    // Created from valid Table for this object
+    // which contains a valid value in this slot
+    unsafe { self._tab.get::<FieldUnion>(RootTable::VT_FIELD42_TYPE, Some(FieldUnion::NONE)).unwrap()}
+  }
+  #[inline]
+  pub fn field42(&self) -> Option<flatbuffers::Table<'a>> {
+    // Safety:
+    // Created from valid Table for this object
+    // which contains a valid value in this slot
+    unsafe { self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Table<'a>>>(RootTable::VT_FIELD42, None)}
+  }
+  #[inline]
+  #[allow(non_snake_case)]
+  pub fn field42_as_f(&self) -> Option<FieldTable<'a>> {
+    if self.field42_type() == FieldUnion::f {
+      self.field42().map(|t| {
+       // Safety:
+       // Created from a valid Table for this object
+       // Which contains a valid union in this slot
+       unsafe { FieldTable::init_from_table(t) }
+     })
+    } else {
+      None
+    }
+  }
+
+}
+
+impl flatbuffers::Verifiable for RootTable<'_> {
+  #[inline]
+  fn run_verifier(
+    v: &mut flatbuffers::Verifier, pos: usize
+  ) -> Result<(), flatbuffers::InvalidFlatbuffer> {
+    use self::flatbuffers::Verifiable;
+    v.visit_table(pos)?
+     .visit_union::<FieldUnion, _>("field42_type", Self::VT_FIELD42_TYPE, "field42", Self::VT_FIELD42, false, |key, v, pos| {
+        match key {
+          FieldUnion::f => v.verify_union_variant::<flatbuffers::ForwardsUOffset<FieldTable>>("FieldUnion::f", pos),
+          _ => Ok(()),
+        }
+     })?
+     .finish();
+    Ok(())
+  }
+}
+pub struct RootTableArgs {
+    pub field42_type: FieldUnion,
+    pub field42: Option<flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>>,
+}
+impl<'a> Default for RootTableArgs {
+  #[inline]
+  fn default() -> Self {
+    RootTableArgs {
+      field42_type: FieldUnion::NONE,
+      field42: None,
+    }
+  }
+}
+
+pub struct RootTableBuilder<'a: 'b, 'b> {
+  fbb_: &'b mut flatbuffers::FlatBufferBuilder<'a>,
+  start_: flatbuffers::WIPOffset<flatbuffers::TableUnfinishedWIPOffset>,
+}
+impl<'a: 'b, 'b> RootTableBuilder<'a, 'b> {
+  #[inline]
+  pub fn add_field42_type(&mut self, field42_type: FieldUnion) {
+    self.fbb_.push_slot::<FieldUnion>(RootTable::VT_FIELD42_TYPE, field42_type, FieldUnion::NONE);
+  }
+  #[inline]
+  pub fn add_field42(&mut self, field42: flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>) {
+    self.fbb_.push_slot_always::<flatbuffers::WIPOffset<_>>(RootTable::VT_FIELD42, field42);
+  }
+  #[inline]
+  pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> RootTableBuilder<'a, 'b> {
+    let start = _fbb.start_table();
+    RootTableBuilder {
+      fbb_: _fbb,
+      start_: start,
+    }
+  }
+  #[inline]
+  pub fn finish(self) -> flatbuffers::WIPOffset<RootTable<'a>> {
+    let o = self.fbb_.end_table(self.start_);
+    flatbuffers::WIPOffset::new(o.value())
+  }
+}
+
+impl core::fmt::Debug for RootTable<'_> {
+  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+    let mut ds = f.debug_struct("RootTable");
+      ds.field("field42_type", &self.field42_type());
+      match self.field42_type() {
+        FieldUnion::f => {
+          if let Some(x) = self.field42_as_f() {
+            ds.field("field42", &x)
+          } else {
+            ds.field("field42", &"InvalidFlatbuffer: Union discriminant does not match value.")
+          }
+        },
+        _ => {
+          let x: Option<()> = None;
+          ds.field("field42", &x)
+        },
+      };
+      ds.finish()
+  }
+}
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq)]
+pub struct RootTableT {
+  pub field42: FieldUnionT,
+}
+impl Default for RootTableT {
+  fn default() -> Self {
+    Self {
+      field42: FieldUnionT::NONE,
+    }
+  }
+}
+impl RootTableT {
+  pub fn pack<'b>(
+    &self,
+    _fbb: &mut flatbuffers::FlatBufferBuilder<'b>
+  ) -> flatbuffers::WIPOffset<RootTable<'b>> {
+    let field42_type = self.field42.field_union_type();
+    let field42 = self.field42.pack(_fbb);
+    RootTable::create(_fbb, &RootTableArgs{
+      field42_type,
+      field42,
+    })
+  }
+}

tests/rust_usage_test/tests/integration_test.rs

@@ -78,6 +78,11 @@ mod arrays_test_generated;
 #[path = "../../keyword_test/mod.rs"]
 mod keyword_test_generated;
 
+// Test rust namer, should not cause compiling issues
+#[allow(dead_code, unused_imports, clippy::all)]
+#[path = "../../rust_namer_test/mod.rs"]
+mod rust_namer_test;
+
 #[rustfmt::skip] // TODO: Use standard rust formatting and remove dead code.
 #[allow(dead_code)]
 mod flatbuffers_tests {