diff --git a/ast.h b/ast.h
index 69c9b3a..b62caa9 100644
--- a/ast.h
+++ b/ast.h
@@ -519,6 +519,81 @@ typedef struct {
     AstExtraData extra_data;
 } Ast;
 
+typedef struct AstPtrType {
+    AstNodeIndex sentinel;
+    AstNodeIndex align_node;
+    AstNodeIndex addrspace_node;
+} AstPtrType;
+
+typedef struct AstPtrTypeBitRange {
+    AstNodeIndex sentinel;
+    AstNodeIndex align_node;
+    AstNodeIndex addrspace_node;
+    AstNodeIndex bit_range_start;
+    AstNodeIndex bit_range_end;
+} AstPtrTypeBitRange;
+
+typedef struct AstFnProtoOne {
+    AstNodeIndex param;
+    AstNodeIndex align_expr;
+    AstNodeIndex addrspace_expr;
+    AstNodeIndex section_expr;
+    AstNodeIndex callconv_expr;
+} AstFnProtoOne;
+
+typedef struct AstFnProto {
+    AstNodeIndex params_start;
+    AstNodeIndex params_end;
+    AstNodeIndex align_expr;
+    AstNodeIndex addrspace_expr;
+    AstNodeIndex section_expr;
+    AstNodeIndex callconv_expr;
+} AstFnProto;
+
+typedef struct AstSubRange {
+    AstNodeIndex start;
+    AstNodeIndex end;
+} AstSubRange;
+
+typedef struct AstSliceSentinel {
+    AstNodeIndex start;
+    AstNodeIndex end;
+    AstNodeIndex sentinel;
+} AstSliceSentinel;
+
+typedef struct AstWhileCont {
+    AstNodeIndex cont_expr;
+    AstNodeIndex then_expr;
+} AstWhileCont;
+
+typedef struct AstWhile {
+    AstNodeIndex cont_expr;
+    AstNodeIndex then_expr;
+    AstNodeIndex else_expr;
+} AstWhile;
+
+typedef struct AstFor {
+    unsigned int inputs : 31;
+    unsigned int has_else : 1;
+} AstFor;
+
+typedef struct AstIf {
+    AstNodeIndex then_expr;
+    AstNodeIndex else_expr;
+} AstIf;
+
+typedef struct AstError {
+    bool is_note;
+    AstTokenIndex token;
+    union {
+        struct {
+            TokenizerTag expected_tag;
+        } expected;
+        struct {
+        } none;
+    } extra;
+} AstError;
+
 Ast astParse(const char* source, uint32_t len);
 
 // MultiArrayList