gccrs: Change specifier of some forward declaration

Change storage specifier of some forward declaration to satisfy compiler
warning.

gcc/rust/ChangeLog:

	* hir/tree/rust-hir-full-decls.h (struct Crate): Change to
	class.
	(class Crate): Likewise.
	(struct StructField): Likewise.
	(class StructField): Likewise.
	(struct TupleField): Likewise.
	(class TupleField): Likewise.
	(struct TraitFunctionDecl): Likewise.
	(class TraitFunctionDecl): Likewise.
	* rust-session-manager.h (struct Crate): Likewise.
	(class Crate): Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

2 files changed, 5 insertions, 5 deletions

diff --git a/gcc/rust/hir/tree/rust-hir-full-decls.h b/gcc/rust/hir/tree/rust-hir-full-decls.h
index 3d3c29e7..a260e7f 100644
--- a/gcc/rust/hir/tree/rust-hir-full-decls.h
+++ b/gcc/rust/hir/tree/rust-hir-full-decls.h
@@ -37,7 +37,7 @@ class LifetimeParam;
 
 class TraitItem;
 class ImplItem;
-struct Crate;
+class Crate;
 class PathExpr;
 
 // rust-path.h
@@ -156,9 +156,9 @@ class UseDeclaration;
 class Function;
 class TypeAlias;
 class Struct;
-struct StructField;
+class StructField;
 class StructStruct;
-struct TupleField;
+class TupleField;
 class TupleStruct;
 class EnumItem;
 class EnumItemTuple;
@@ -168,7 +168,7 @@ class Enum;
 class Union;
 class ConstantItem;
 class StaticItem;
-struct TraitFunctionDecl;
+class TraitFunctionDecl;
 class TraitItemFunc;
 class TraitItemConst;
 class TraitItemType;
diff --git a/gcc/rust/rust-session-manager.h b/gcc/rust/rust-session-manager.h
index b2e77ac..b6d89a8 100644
--- a/gcc/rust/rust-session-manager.h
+++ b/gcc/rust/rust-session-manager.h
@@ -42,7 +42,7 @@ struct Crate;
 }
 // crate forward decl
 namespace HIR {
-struct Crate;
+class Crate;
 }
 
 /* Data related to target, most useful for conditional compilation and