gistfile1.diff

Index: iseq.h
===================================================================
--- iseq.h	(revision 24493)
+++ iseq.h	(working copy)
@@ -85,6 +85,7 @@
     int flip_cnt;
     int label_no;
     int node_level;
+    int last_line_traced;
     const rb_compile_option_t *option;
 };
 
Index: compile.c
===================================================================
--- compile.c	(revision 24493)
+++ compile.c	(working copy)
@@ -2936,6 +2936,14 @@
 {
     enum node_type type;
 
+    if (node)
+        iseq->compile_data->last_line = (int)nd_line(node);
+
+    if (iseq->compile_data->last_line != iseq->compile_data->last_line_traced) {
+        iseq->compile_data->last_line_traced = iseq->compile_data->last_line;
+        ADD_TRACE(ret, iseq->compile_data->last_line, RUBY_EVENT_LINE);
+    }
+
     if (node == 0) {
 	if (!poped) {
 	    debugs("node: NODE_NIL(implicit)\n");
@@ -2944,21 +2952,18 @@
 	return COMPILE_OK;
     }
 
-    iseq->compile_data->last_line = (int)nd_line(node);
     debug_node_start(node);
 
     type = nd_type(node);
 
-    if (node->flags & NODE_FL_NEWLINE) {
-	ADD_TRACE(ret, nd_line(node), RUBY_EVENT_LINE);
-    }
-
     switch (type) {
       case NODE_BLOCK:{
 	while (node && nd_type(node) == NODE_BLOCK) {
 	    COMPILE_(ret, "BLOCK body", node->nd_head,
 		     (node->nd_next == 0 && poped == 0) ? 0 : 1);
 	    node = node->nd_next;
+	    if (node)
+	        iseq->compile_data->last_line = (int)nd_line(node);
 	}
 	if (node) {
 	    COMPILE_(ret, "BLOCK next", node->nd_next, poped);