Merge 'pass' node into existing ASTKeyword node type

ASTNode.cpp

@@ -52,7 +52,7 @@ const char* ASTCompare::op_str() const
 const char* ASTKeyword::word_str() const
 {
     static const char* s_word_strings[] = {
-        "break", "continue"
+        "pass", "break", "continue"
     };
     return s_word_strings[key()];
 }

ASTNode.h

@@ -14,10 +14,10 @@ public:
         NODE_DELETE, NODE_FUNCTION, NODE_CLASS, NODE_CALL, NODE_IMPORT,
         NODE_TUPLE, NODE_LIST, NODE_MAP, NODE_SUBSCR, NODE_PRINT,
         NODE_CONVERT, NODE_KEYWORD, NODE_RAISE, NODE_EXEC, NODE_BLOCK,
-        NODE_COMPREHENSION,
+        NODE_COMPREHENSION, NODE_LOADBUILDCLASS,
 
-        // Empty nodes
-        NODE_PASS, NODE_LOCALS, NODE_LOADBUILDCLASS
+        // Empty node types
+        NODE_LOCALS,
     };
 
     ASTNode(int type = NODE_INVALID) : m_refs(0), m_type(type) { }
@@ -395,7 +395,7 @@ private:
 class ASTKeyword : public ASTNode {
 public:
     enum Word {
-        KW_BREAK, KW_CONTINUE
+        KW_PASS, KW_BREAK, KW_CONTINUE
     };
 
     ASTKeyword(Word key) : ASTNode(NODE_KEYWORD), m_key(key) { }

ASTree.cpp

@@ -2208,7 +2208,7 @@ static void print_block(PycRef<ASTBlock> blk, PycModule* mod) {
     ASTBlock::list_t lines = blk->nodes();
 
     if (lines.size() == 0) {
-        PycRef<ASTNode> pass = new ASTNode(ASTNode::NODE_PASS);
+        PycRef<ASTNode> pass = new ASTKeyword(ASTKeyword::KW_PASS);
         start_line(cur_indent);
         print_src(pass, mod);
     }
@@ -2457,9 +2457,6 @@ void print_src(PycRef<ASTNode> node, PycModule* mod)
             }
         }
         break;
-    case ASTNode::NODE_PASS:
-        fputs("pass", pyc_output);
-        break;
     case ASTNode::NODE_PRINT:
         if (node.cast<ASTPrint>()->value() == NULL) {
             if (!inPrint) {
@@ -2897,7 +2894,7 @@ void decompyle(PycRef<PycCode> code, PycModule* mod)
     // This is outside the clean check so a source block will always
     // be compilable, even if decompylation failed.
     if (clean->nodes().size() == 0 && !code.isIdent(mod->code()))
-        clean->append(new ASTNode(ASTNode::NODE_PASS));
+        clean->append(new ASTKeyword(ASTKeyword::KW_PASS));
 
     inPrint = false;
     bool part1clean = cleanBuild;