gccrs: Add missing virtual destructor to interfaces

Those interfaces missed a virtual destructor. This lead to several
warning.

gcc/rust/ChangeLog:

	* ast/rust-ast.h: Add virtual destructor.
	* expand/rust-macro-expand.h: Likewise.

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

2 files changed, 3 insertions, 0 deletions

diff --git a/gcc/rust/ast/rust-ast.h b/gcc/rust/ast/rust-ast.h
index 1f6d0c0..520baae 100644
--- a/gcc/rust/ast/rust-ast.h
+++ b/gcc/rust/ast/rust-ast.h
@@ -90,6 +90,7 @@ enum class Kind
 class Visitable
 {
 public:
+  virtual ~Visitable () = default;
   virtual void accept_vis (ASTVisitor &vis) = 0;
 };
 
diff --git a/gcc/rust/expand/rust-macro-expand.h b/gcc/rust/expand/rust-macro-expand.h
index 85af83f..e5366c4 100644
--- a/gcc/rust/expand/rust-macro-expand.h
+++ b/gcc/rust/expand/rust-macro-expand.h
@@ -90,6 +90,8 @@ public:
     Repetition,
   };
 
+  virtual ~MatchedFragmentContainer () = default;
+
   virtual Kind get_kind () const = 0;
 
   virtual std::string as_string () const = 0;