enhanced the binop expression check in leave_list() in read.c

fixed the issue of the lost line terminator after the comment text which caused the next line to be treated as the same line

t/do-5001.err

@@ -1,3 +1,13 @@
 ## if `do` is not enclosed in `( )`, variable declaration is prohibited
 do { | k | set k 10 };
 do | k | {set k 10;}; ##ERROR: syntax error - variable declaration disallowed
+
+---
+
+## if `do` is not enclosed in `( )`, it supports only the limited number of expressions.
+
+do ; ## this is ok
+
+do 1; ## this is ok
+
+do { set k 10; printf "k=%d\n" k; } { set k 20; printf "k=%d\n" k; }; ##ERROR: syntax error - more than one expression after do