recognize the newline after a comment.  this keeps the line
number correct, and in interactive mode correctly prompts
for more input.

Reference: /n/sources/patch/maybe/acid-lex
Date: Sun Sep  4 17:05:56 CES 2011
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/acid/lex.c	Sun Sep  4 17:04:11 2011
+++ /sys/src/cmd/acid/lex.c	Sun Sep  4 17:04:09 2011
@@ -329,6 +329,14 @@
 	case '\t':
 		goto loop;
 
+	case '/':
+		c = lexc();
+		if(c != '/'){
+			unlexc(c);
+			return '/';
+		}
+		eatnl();
+
 	case '\n':
 		line++;
 		if(interactive == 0)
@@ -390,15 +398,6 @@
 			return Tinc;
 		unlexc(c);
 		return '+';
-
-	case '/':
-		c = lexc();
-		if(c == '/') {
-			eatnl();
-			goto loop;
-		}
-		unlexc(c);
-		return '/';
 
 	case '\'':
 		c = lexc();