Index: tools/clang-diff/ClangDiff.cpp
===================================================================
--- tools/clang-diff/ClangDiff.cpp
+++ tools/clang-diff/ClangDiff.cpp
@@ -25,9 +25,14 @@
 
 static cl::opt<bool>
     ASTDump("ast-dump",
-            cl::desc("Print the internal representation of the AST as JSON."),
+            cl::desc("Print the internal representation of the AST."),
             cl::init(false), cl::cat(ClangDiffCategory));
 
+static cl::opt<bool> ASTDumpJson(
+    "ast-dump-json",
+    cl::desc("Print the internal representation of the AST as JSON."),
+    cl::init(false), cl::cat(ClangDiffCategory));
+
 static cl::opt<bool> NoCompilationDatabase(
     "no-compilation-database",
     cl::desc(
@@ -168,6 +173,15 @@
   OS << "(" << Id << ")";
 }
 
+static void printTree(raw_ostream &OS, diff::SyntaxTree &Tree) {
+  for (diff::NodeId Id : Tree) {
+    for (int I = 0; I < Tree.getNode(Id).Depth; ++I)
+      OS << " ";
+    printNode(OS, Tree, Id);
+    OS << "\n";
+  }
+}
+
 static void printDstChange(raw_ostream &OS, diff::ASTDiff &Diff,
                            diff::SyntaxTree &SrcTree, diff::SyntaxTree &DstTree,
                            diff::NodeId Dst) {
@@ -208,7 +222,7 @@
     return 1;
   }
 
-  if (ASTDump) {
+  if (ASTDump || ASTDumpJson) {
     if (!DestinationPath.empty()) {
       llvm::errs() << "Error: Please specify exactly one filename.\n";
       return 1;
@@ -217,6 +231,10 @@
     if (!AST)
       return 1;
     diff::SyntaxTree Tree(AST->getASTContext());
+    if (ASTDump) {
+      printTree(llvm::outs(), Tree);
+      return 0;
+    }
     llvm::outs() << R"({"filename":")";
     printJsonString(llvm::outs(), SourcePath);
     llvm::outs() << R"(","root":)";