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io-filename: can't return a static string - it might get freed

--- a/iostream.c

+++ b/iostream.c

@@ -344,7 +344,7 @@

 BUILTIN("io-filename", io_filename)

 {

 	argcount(nargs, 1);

-	return cvalue_static_cstring(toiostream(args[0])->loc.filename);

+	return string_from_cstr(toiostream(args[0])->loc.filename);

 }

 BUILTIN("io-line", io_line)