Updates Rust codegen to use proper indentation (#8952)

* Fixes identation of generated Rust code

* Regenerates generated schemas

tests/monster_test_serialize/my_game/example/race_generated.rs

@@ -14,10 +14,10 @@ pub const ENUM_MAX_RACE: i8 = 2;
 #[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_RACE: [Race; 4] = [
-  Race::None,
-  Race::Human,
-  Race::Dwarf,
-  Race::Elf,
+    Race::None,
+    Race::Human,
+    Race::Dwarf,
+    Race::Elf,
 ];
 
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
@@ -26,49 +26,49 @@ pub struct Race(pub i8);
 
 #[allow(non_upper_case_globals)]
 impl Race {
-  pub const None: Self = Self(-1);
-  pub const Human: Self = Self(0);
-  pub const Dwarf: Self = Self(1);
-  pub const Elf: Self = Self(2);
+    pub const None: Self = Self(-1);
+    pub const Human: Self = Self(0);
+    pub const Dwarf: Self = Self(1);
+    pub const Elf: Self = Self(2);
 
-  pub const ENUM_MIN: i8 = -1;
-  pub const ENUM_MAX: i8 = 2;
-  pub const ENUM_VALUES: &'static [Self] = &[
-    Self::None,
-    Self::Human,
-    Self::Dwarf,
-    Self::Elf,
-  ];
+    pub const ENUM_MIN: i8 = -1;
+    pub const ENUM_MAX: i8 = 2;
+    pub const ENUM_VALUES: &'static [Self] = &[
+        Self::None,
+        Self::Human,
+        Self::Dwarf,
+        Self::Elf,
+    ];
 
-  /// Returns the variant's name or "" if unknown.
-  pub fn variant_name(self) -> Option<&'static str> {
-    match self {
-      Self::None => Some("None"),
-      Self::Human => Some("Human"),
-      Self::Dwarf => Some("Dwarf"),
-      Self::Elf => Some("Elf"),
-      _ => None,
+    /// Returns the variant's name or "" if unknown.
+    pub fn variant_name(self) -> Option<&'static str> {
+        match self {
+            Self::None => Some("None"),
+            Self::Human => Some("Human"),
+            Self::Dwarf => Some("Dwarf"),
+            Self::Elf => Some("Elf"),
+            _ => None,
+        }
     }
-  }
 }
 
 impl ::core::fmt::Debug for Race {
-  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))
+    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 Serialize for Race {
-  fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-  where
-    S: Serializer,
-  {
-    serializer.serialize_unit_variant("Race", self.0 as u32, self.variant_name().unwrap())
-  }
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_unit_variant("Race", self.0 as u32, self.variant_name().unwrap())
+    }
 }
 
 impl<'de> serde::Deserialize<'de> for Race {
@@ -91,13 +91,13 @@ impl<'de> serde::Deserialize<'de> for Race {
 }
 
 impl<'a> ::flatbuffers::Follow<'a> for Race {
-  type Inner = Self;
+    type Inner = Self;
 
-  #[inline]
-  unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    let b = unsafe { ::flatbuffers::read_scalar_at::<i8>(buf, loc) };
-    Self(b)
-  }
+    #[inline]
+    unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
+        let b = unsafe { ::flatbuffers::read_scalar_at::<i8>(buf, loc) };
+        Self(b)
+    }
 }
 
 impl ::flatbuffers::Push for Race {
@@ -110,28 +110,28 @@ impl ::flatbuffers::Push for Race {
 }
 
 impl ::flatbuffers::EndianScalar for Race {
-  type Scalar = i8;
+    type Scalar = i8;
 
-  #[inline]
-  fn to_little_endian(self) -> i8 {
-    self.0.to_le()
-  }
+    #[inline]
+    fn to_little_endian(self) -> i8 {
+        self.0.to_le()
+    }
 
-  #[inline]
-  #[allow(clippy::wrong_self_convention)]
-  fn from_little_endian(v: i8) -> Self {
-    let b = i8::from_le(v);
-    Self(b)
-  }
+    #[inline]
+    #[allow(clippy::wrong_self_convention)]
+    fn from_little_endian(v: i8) -> Self {
+        let b = i8::from_le(v);
+        Self(b)
+    }
 }
 
 impl<'a> ::flatbuffers::Verifiable for Race {
-  #[inline]
-  fn run_verifier(
-    v: &mut ::flatbuffers::Verifier, pos: usize
-  ) -> Result<(), ::flatbuffers::InvalidFlatbuffer> {
-    i8::run_verifier(v, pos)
-  }
+    #[inline]
+    fn run_verifier(
+        v: &mut ::flatbuffers::Verifier, pos: usize
+    ) -> Result<(), ::flatbuffers::InvalidFlatbuffer> {
+        i8::run_verifier(v, pos)
+    }
 }
 
 impl ::flatbuffers::SimpleToVerifyInSlice for Race {}