command line: improve -c option diagnostic.

* txr.c (txr_main): Fix misleading message formatting here.
The spec_file string is irrelevant; we must show the
argument to -c which is in arg.  The name of the input source
is spec_file_str; let's show that.

1 files changed, 2 insertions, 2 deletions

diff --git a/txr.c b/txr.c
index cb2e10f0..584ec159 100644
--- a/txr.c
+++ b/txr.c
@@ -826,8 +826,8 @@ int txr_main(int argc, char **argv)
         }
         if (parse_stream) {
           format(std_error,
-                 lit("~a: -c ~a: input file has already been established\n"),
-                 prog_string, spec_file, nao);
+                 lit("~a: -c ~a: input source ~a has already been established\n"),
+                 prog_string, arg, spec_file_str, nao);
           return EXIT_FAILURE;
         }
         specstring = arg;