Implement `Debug` trait for Rust flatbuffers. (#6207)

* Refactor idl_gen_rust to a ForAllX continuation pattern.

* Removed unneeded SetValue and updated sample rust gencode

* Make Rust flatbuffers print right

* Generated code and removed unnecessary trait constraint

* bumped rust version. Release required

* removed an unwrap in Rust Debug-print unions

* Tested formatting flatbuffers in rust.

* Set float precision in flaky debug-print test

* impl Debug for structs too

Co-authored-by: Casper Neo <cneo@google.com>

1 files changed, 27 insertions, 3 deletions

diff --git a/tests/namespace_test/namespace_test2_generated.rs b/tests/namespace_test/namespace_test2_generated.rs
index c14f189c..b1d84cf0 100644
--- a/tests/namespace_test/namespace_test2_generated.rs
+++ b/tests/namespace_test/namespace_test2_generated.rs
@@ -21,7 +21,7 @@ pub mod namespace_a {
   use self::flatbuffers::EndianScalar;
 
 pub enum TableInFirstNSOffset {}
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, PartialEq)]
 
 pub struct TableInFirstNS<'a> {
   pub _tab: flatbuffers::Table<'a>,
@@ -122,8 +122,17 @@ impl<'a: 'b, 'b> TableInFirstNSBuilder<'a, 'b> {
   }
 }
 
+impl std::fmt::Debug for TableInFirstNS<'_> {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    let mut ds = f.debug_struct("TableInFirstNS");
+      ds.field("foo_table", &self.foo_table());
+      ds.field("foo_enum", &self.foo_enum());
+      ds.field("foo_struct", &self.foo_struct());
+      ds.finish()
+  }
+}
 pub enum SecondTableInAOffset {}
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, PartialEq)]
 
 pub struct SecondTableInA<'a> {
   pub _tab: flatbuffers::Table<'a>,
@@ -200,6 +209,13 @@ impl<'a: 'b, 'b> SecondTableInABuilder<'a, 'b> {
   }
 }
 
+impl std::fmt::Debug for SecondTableInA<'_> {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    let mut ds = f.debug_struct("SecondTableInA");
+      ds.field("refer_to_c", &self.refer_to_c());
+      ds.finish()
+  }
+}
 }  // pub mod NamespaceA
 
 #[allow(unused_imports, dead_code)]
@@ -213,7 +229,7 @@ pub mod namespace_c {
   use self::flatbuffers::EndianScalar;
 
 pub enum TableInCOffset {}
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, PartialEq)]
 
 pub struct TableInC<'a> {
   pub _tab: flatbuffers::Table<'a>,
@@ -302,5 +318,13 @@ impl<'a: 'b, 'b> TableInCBuilder<'a, 'b> {
   }
 }
 
+impl std::fmt::Debug for TableInC<'_> {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    let mut ds = f.debug_struct("TableInC");
+      ds.field("refer_to_a1", &self.refer_to_a1());
+      ds.field("refer_to_a2", &self.refer_to_a2());
+      ds.finish()
+  }
+}
 }  // pub mod NamespaceC