Use correct int return type for stream input operations

This makes it safe to compare results to -1 to indicate EOF,
regardless of whether char is considered signed or unsigned;
and so eliminates compiler warnings on platforms such as ARM.

Fixes bug #2058.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/token.h b/src/token.h
index 5d9f1fac..db592475 100644
--- a/src/token.h
+++ b/src/token.h
@@ -126,7 +126,7 @@ struct expr_t::token_t : public noncopyable
   void next(std::istream& in, const parse_flags_t& flags);
   void rewind(std::istream& in);
   void unexpected(const char wanted = '\0');
-  void expected(const char wanted, const char c = '\0');
+  void expected(const char wanted, const int c);
   void expected(const kind_t wanted);
 };