https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56743
--- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Potential simple patch.
Index: io/list_read.c
===================================================================
--- io/list_read.c (revision 222110)
+++ io/list_read.c (working copy)
@@ -53,7 +53,7 @@ typedef unsigned char uchar;
case '5': case '6': case '7': case '8': case '9'
#define CASE_SEPARATORS case ' ': case ',': case '/': case '\n': case '\t': \
- case '\r': case ';'
+ case '\r': case ';': case '!'
/* This macro assumes that we're operating on a variable. */
