diff --git a/bin/main.c b/bin/main.c
index f34054e..ec6a824 100644
--- a/bin/main.c
+++ b/bin/main.c
@@ -111,7 +111,7 @@ struct xtn_t
 		hcl_oow_t len;
 		hcl_oow_t pos;
 		int eof;
-		int ongoing;
+		hcl_oow_t ncompexprs; /* number of compiled expressions */
 	} feed;
 	/*hcl_oop_t sym_errstr;*/
 };
@@ -524,43 +524,22 @@ static int on_fed_cnode_in_interactive_mode (hcl_t* hcl, hcl_cnode_t* obj)
 	 * if a single line or continued lines contain multiple expressions,
 	 * execution is delayed until the last expression is compiled. */
 
-	if (!xtn->feed.ongoing)
+	if (xtn->feed.ncompexprs <= 0)
 	{
 		/* the first expression in the current user input line.
 		 * arrange to clear byte-codes before compiling the expression. */
 		flags = HCL_COMPILE_CLEAR_CODE | HCL_COMPILE_CLEAR_FNBLK;
-		xtn->feed.ongoing = 1;
 	}
 
 	if (hcl_compile(hcl, obj, flags) <= -1)
 	{
 		print_error(hcl, "failed to compile");
 		xtn->feed.pos = xtn->feed.len; /* arrange to discard the rest of the line */
-		show_prompt (hcl, 0);
 	}
-#if 0
 	else
 	{
-		hcl_oow_t i;
-
-		for (i = xtn->feed.pos; i < xtn->feed.len; i++)
-		{
-			/* this loop is kind of weird. it is to check the current feed buffer is left with
-			 * spaces only and to execute the compiled bytecodes so far if the check is true.
-			 * the check is performed because a single line of the user input can have multiple
-			 * expressions joined with a semicolon or contains trailing spaces. */
-			if (!hcl_is_bch_space(xtn->feed.buf[i])) break;
-		}
-
-		if (i >= xtn->feed.len || xtn->feed.pos >= xtn->feed.len)
-		{
-			/* nothing more to feed */
-			execute_in_interactive_mode (hcl);
-			xtn->feed.ongoing = 0;
-			show_prompt (hcl, 0);
-		}
+		xtn->feed.ncompexprs++;
 	}
-#endif
 
 	return 0;
 }
@@ -590,12 +569,13 @@ static int get_line (hcl_t* hcl, xtn_t* xtn, FILE* fp)
 			}
 
 			xtn->feed.eof = 1;
+			if (xtn->feed.len <= 0) return 0;
+
 			break;
 		}
 
-		/* TOTO: buffer check... */
 		xtn->feed.buf[xtn->feed.len++] = (hcl_bch_t)(unsigned int)ch;
-		if (ch == '\n') break;
+		if (ch == '\n' || xtn->feed.len >= HCL_COUNTOF(xtn->feed.buf)) break;
 	}
 
 	return 1;
@@ -647,23 +627,12 @@ static int feed_loop (hcl_t* hcl, xtn_t* xtn, int verbose)
 			hcl_oow_t pos;
 			hcl_oow_t len;
 
-			/* read a while line regardless of the actual expression */
+			/* read a line regardless of the actual expression */
 			n = get_line(hcl, xtn, fp);
 			if (n <= -1) goto oops;
 			if (n == 0) break;
 
 			/* feed the line */
-		#if 0
-			while (xtn->feed.pos < xtn->feed.len)
-			{
-				hcl_bch_t c = xtn->feed.buf[xtn->feed.pos++];
-				if (hcl_feedbchars(hcl, &c, 1) <= -1)
-				{
-					print_error (hcl, "failed to feed");
-					show_prompt (hcl, 0);
-				}
-			}
-		#else
 			pos = xtn->feed.pos;
 			/* do this before calling hcl_feedbchars() so that the callback sees the updated value */
 			xtn->feed.pos = xtn->feed.len;
@@ -671,39 +640,21 @@ static int feed_loop (hcl_t* hcl, xtn_t* xtn, int verbose)
 			if (hcl_feedbchars(hcl, &xtn->feed.buf[pos], len) <= -1)
 			{
 				print_error (hcl, "failed to feed");
-				show_prompt (hcl, 0);
+				if (len > 0) show_prompt (hcl, 0);
 			}
 			else
 			{
-				/* a := (1 + 2 ##askldfjasldkfjasd
-				   ); b := (2 + 3
-// TODO: how to know if 'b := (2 + 3' is still not completely compiled?.
-
-
-just new lines..
-or lines with comments only...
-+ 1 2 <-- prohibited binary operator + <--- don't look right...
-				 */
-
-				if (xtn->feed.ongoing && hcl_getbclen(hcl) > 0 && !hcl_feedpending(hcl))
+				/* TODO: check if this works when HCL_TRAIT_LANG_ENABLE_EOL is not set */
+				if (!hcl_feedpending(hcl))
 				{
-					execute_in_interactive_mode (hcl);
-					xtn->feed.ongoing = 0;
-					if (len > 0) show_prompt (hcl, 0);
-				}
-				else if (len > 0)
-				{
-					if (!xtn->feed.ongoing && !hcl_feedpending(hcl))
-						show_prompt (hcl, 0);
-				}
-				else
-				{
-					/* eof reached */
-					hcl_logbfmt (hcl, HCL_LOG_STDOUT, "\n");
-					if (hcl_feedpending(hcl)) print_error (hcl, "sudden end of input");
+					if (xtn->feed.ncompexprs > 0 && hcl_getbclen(hcl) > 0)
+					{
+						execute_in_interactive_mode (hcl);
+						xtn->feed.ncompexprs = 0;
+					}
+					show_prompt (hcl, 0);
 				}
 			}
-		#endif
 		}
 	}
 	else
@@ -727,6 +678,7 @@ or lines with comments only...
 		}
 	}
 
+	hcl_logbfmt (hcl, HCL_LOG_STDOUT, "\n");
 	if (hcl_endfeed(hcl) <= -1)
 	{
 	feed_error:
diff --git a/lib/read.c b/lib/read.c
index 0d82c03..5bc400d 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -1250,6 +1250,7 @@ static int feed_process_token (hcl_t* hcl)
 	hcl_frd_t* frd = &hcl->c->feed.rd;
 	hcl_loc_t* list_loc = HCL_NULL;
 	int rbrace_again = 0;
+	int oops_ret = -1;
 	/* TODO: frd->obj and frd->list_loc can become local variables in this function.. */
 
 	/* this function composes an s-expression non-recursively
@@ -1293,7 +1294,15 @@ static int feed_process_token (hcl_t* hcl)
 			goto oops;
 
 		case HCL_TOK_EOF:
-			hcl_setsynerr (hcl, HCL_SYNERR_EOF, TOKEN_LOC(hcl), TOKEN_NAME(hcl));
+			if (hcl_feedpending(hcl))
+			{
+				hcl_setsynerr (hcl, HCL_SYNERR_EOF, TOKEN_LOC(hcl), TOKEN_NAME(hcl));
+			}
+			else
+			{
+				/* ugly hacking to return success intead while performing clean-up */
+				oops_ret = 0;
+			}
 			goto oops;
 
 		case HCL_TOK_INCLUDE:
@@ -1754,7 +1763,7 @@ static int feed_process_token (hcl_t* hcl)
 			break;
 	}
 
-	if (!frd->obj) goto oops; /* TODO: this doesn't have to be check if jump has been made to auto_xlist... so restructure the flow */
+	if (!frd->obj) goto oops; /* TODO: this doesn't have to be checked if jump has been made to auto_xlist... so restructure the flow */
 
 #if 0
 	/* check if the element is read for a quoted list */
@@ -1812,6 +1821,7 @@ ok:
 		list_loc = HCL_NULL;
 		goto rbrace_ok;
 	}
+
 	return 0;
 
 oops:
@@ -1825,7 +1835,7 @@ oops:
 	/* clean up the reader stack for a list */
 	feed_clean_up_reader_stack (hcl);
 	feed_continue (hcl, HCL_FLX_START);
-	return -1;
+	return oops_ret;
 }
 
 /* ------------------------------------------------------------------------ */
@@ -1880,8 +1890,8 @@ static delim_token_t delim_token_tab[] =
 	{ ":>",       2, HCL_TOK_COLONGT },
 	{ ":<",       2, HCL_TOK_COLONLT },
 	{ ":*",       2, HCL_TOK_COLONSTAR }, /* class instantiation method */
-	{ "::",       2, HCL_TOK_DBLCOLONS },
-	{ ":::",      3, HCL_TOK_TRPCOLONS  }, /* superclass, class variables, class methods */
+	{ "::",       2, HCL_TOK_DBLCOLONS }, /* superclass, class variables, class methods */
+	{ ":::",      3, HCL_TOK_TRPCOLONS  },
 
 	{ ";",        1, HCL_TOK_SEMICOLON }
 };
@@ -3223,7 +3233,7 @@ int hcl_endfeed (hcl_t* hcl)
 
 int hcl_feedpending (hcl_t* hcl)
 {
-	return hcl->c->r.st != HCL_NULL;
+	return !(hcl->c->r.st == HCL_NULL && FLX_STATE(hcl) == HCL_FLX_START);
 }
 
 int hcl_feed (hcl_t* hcl, const hcl_ooch_t* data, hcl_oow_t len)
@@ -3277,21 +3287,7 @@ int hcl_feed (hcl_t* hcl, const hcl_ooch_t* data, hcl_oow_t len)
 		for (i = 0; i < 1;) /* weird loop in case feed_char() returns 0 */
 		{
 			x = feed_char(hcl, HCL_OOCI_EOF);
-			if (x <= -1)
-			{
-				int exp_level = !(hcl->option.trait & HCL_TRAIT_LANG_ENABLE_EOL); /* 0 if EOL is on, 1 if EOL is off */
-				if (hcl->c->feed.rd.level <= exp_level && HCL_ERRNUM(hcl) == HCL_ESYNERR && hcl_getsynerrnum(hcl) == HCL_SYNERR_EOF)
-				{
-					/* convert this EOF error to success as the caller knows EOF in the feed mode.
-					 * the caller can safely stop feeding after gettting success from hcl_feed(hcl, HCL_NULL, 0);
-					 * in the feed mode, this function doesn't set HCL_EFINIS. */
-					x = 1;
-				}
-				else
-				{
-					goto oops;
-				}
-			}
+			if (x <= -1) goto oops;
 			i += x;
 		}
 	}