Change core calls of isALNUM() to isWORDCHAR()

The latter is more clearly named to indicate it includes the underscore.

1 files changed, 1 insertions, 1 deletions

diff --git a/doio.c b/doio.c
index 1cc0e412ff..795d13857f 100644
--- a/doio.c
+++ b/doio.c
@@ -1499,7 +1499,7 @@ Perl_do_exec3(pTHX_ const char *incmd, int fd, int do_report)
 	goto doshell;
 
     s = cmd;
-    while (isALNUM(*s))
+    while (isWORDCHAR(*s))
 	s++;	/* catch VAR=val gizmo */
     if (*s == '=')
 	goto doshell;