Allow unicode in identifiers.

src/cmd/9term/9term.c

diff --git a/src/cmd/9term/9term.c b/src/cmd/9term/9term.c
index 34c155c..a620410 100644
--- a/src/cmd/9term/9term.c
+++ b/src/cmd/9term/9term.c
@@ -307,9 +307,7 @@
 int
 isexpand(Rune r)
 {
-	return r=='_' || ('0' <= r && r <= '9') 
-		|| ('a' <= r && r <= 'z')
-		|| ('A' <= r && r <= 'Z');
+	return r=='_' || ('0' <= r && r <= '9') || isalpharune(r);
 }
 
 void