Use MacroInvocLexerBase in MacroInvocLexer

gcc/rust/ChangeLog:

	* expand/rust-macro-invoc-lexer.cc
	(MacroInvocLexer::skip_token): Remove.
	* expand/rust-macro-invoc-lexer.h
	(class MacroInvocLexer): Extend MacroInvocLexerBase.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

gcc/rust/expand/rust-macro-invoc-lexer.cc

@@ -30,13 +30,6 @@ MacroInvocLexer::peek_token (int n)
   return token_stream.at (offs + n)->get_tok_ptr ();
 }
 
-// Advances current token to n + 1 tokens ahead of current position.
-void
-MacroInvocLexer::skip_token (int n)
-{
-  offs += (n + 1);
-}
-
 void
 MacroInvocLexer::split_current_token (TokenId new_left, TokenId new_right)
 {

gcc/rust/expand/rust-macro-invoc-lexer.h

@@ -49,11 +49,11 @@ template <class T> class MacroInvocLexerBase
   std::vector<T> token_stream;
 };
 
-class MacroInvocLexer
+class MacroInvocLexer : public MacroInvocLexerBase<std::unique_ptr<AST::Token>>
 {
 public:
   MacroInvocLexer (std::vector<std::unique_ptr<AST::Token>> stream)
-    : offs (0), token_stream (std::move (stream))
+    : MacroInvocLexerBase (std::move (stream))
   {}
 
   // Returns token n tokens ahead of current position.
@@ -62,32 +62,13 @@ class MacroInvocLexer
   // Peeks the current token.
   const_TokenPtr peek_token () { return peek_token (0); }
 
-  // Advances current token to n + 1 tokens ahead of current position.
-  void skip_token (int n);
-
-  // Skips the current token.
-  void skip_token () { skip_token (0); }
-
   // Splits the current token into two. Intended for use with nested generics
   // closes (i.e. T<U<X>> where >> is wrongly lexed as one token). Note that
   // this will only work with "simple" tokens like punctuation.
   void split_current_token (TokenId new_left, TokenId new_right);
 
-  std::string get_filename () const
-  {
-    // FIXME
-    rust_unreachable ();
-    return "FIXME";
-  }
-
-  size_t get_offs () const { return offs; }
-
   std::vector<std::unique_ptr<AST::Token>>
   get_token_slice (size_t start_idx, size_t end_idx) const;
-
-private:
-  size_t offs;
-  std::vector<std::unique_ptr<AST::Token>> token_stream;
 };
 } // namespace Rust