diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ed363ca
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+AbleGo
+======
+
+Reference: https://go.dev/ref/spec
diff --git a/default.nix b/default.nix
index 82c1fc8..905757e 100644
--- a/default.nix
+++ b/default.nix
@@ -6,6 +6,6 @@ mkSilverBin {
 
   src = nix-gitignore.gitignoreSource [ ./.gitignore ] ./.;
 
-  grammarName = "io:mzhang:ableGo:compiler";
+  grammarName = "io:mzhang:ableGo:Compiler";
   javaFlags = [ "-Xss8M" ];
 }
diff --git a/examples/trivial.go b/examples/trivial.go
new file mode 100644
index 0000000..7905807
--- /dev/null
+++ b/examples/trivial.go
@@ -0,0 +1,5 @@
+package main
+
+func main() {
+
+}
diff --git a/flake.lock b/flake.lock
index 9935e9f..1c12be5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -14,24 +14,14 @@
         "type": "indirect"
       }
     },
-    "flake-utils_2": {
-      "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
-        "type": "github"
-      },
-      "original": {
-        "id": "flake-utils",
-        "type": "indirect"
-      }
-    },
     "melt": {
       "inputs": {
-        "flake-utils": "flake-utils_2",
-        "nixpkgs": "nixpkgs"
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
       },
       "locked": {
         "lastModified": 1667881871,
@@ -48,20 +38,6 @@
       }
     },
     "nixpkgs": {
-      "locked": {
-        "lastModified": 1666926733,
-        "narHash": "sha256-+gYfOEnQVISPDRNoWm2VJD5OEuTUySt48RchLpvm61o=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "f44ba1be526c8da9e79a5759feca2365204003f6",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs_2": {
       "locked": {
         "lastModified": 1667629849,
         "narHash": "sha256-P+v+nDOFWicM4wziFK9S/ajF2lc0N2Rg9p6Y35uMoZI=",
@@ -79,7 +55,7 @@
       "inputs": {
         "flake-utils": "flake-utils",
         "melt": "melt",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index abb0523..39d8f93 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,11 @@
 {
   description = "A very basic flake";
 
-  inputs.melt.url = "sourcehut:~remexre/melt.nix";
+  inputs.melt = {
+    url = "sourcehut:~remexre/melt.nix";
+    inputs.nixpkgs.follows = "nixpkgs";
+    inputs.flake-utils.follows = "flake-utils";
+  };
 
   outputs = { self, nixpkgs, flake-utils, melt }:
     flake-utils.lib.eachDefaultSystem (system:
@@ -21,6 +25,9 @@
 
         packages = flake-utils.lib.flattenTree flakePkgs;
 
-        devShell = pkgs.mkShell { inputsFrom = with packages; [ ablego ]; };
+        devShell = pkgs.mkShell {
+          inputsFrom = with packages; [ ablego ];
+          packages = with pkgs; [ go ];
+        };
       });
 }
diff --git a/grammars/io.mzhang.ableGo/compiler/Main.sv b/grammars/io.mzhang.ableGo/Compiler/Main.sv
similarity index 55%
rename from grammars/io.mzhang.ableGo/compiler/Main.sv
rename to grammars/io.mzhang.ableGo/Compiler/Main.sv
index 80a786c..a59c1e6 100644
--- a/grammars/io.mzhang.ableGo/compiler/Main.sv
+++ b/grammars/io.mzhang.ableGo/Compiler/Main.sv
@@ -1,11 +1,16 @@
+imports io:mzhang:ableGo:ConcreteSyntax as cst;
+
 function main
 IOVal<Integer> ::= args::[String] ioIn::IOToken
 {
   local fileName :: String = head(args);
 
   local result :: IO<Integer> = do {
+    text :: String <- readFile(fileName);
     return 123;
   };
 
   return evalIO(result, ioIn);
 }
+
+parser AbleGoParser :: cst:Root { io:mzhang:ableGo:ConcreteSyntax; }
diff --git a/grammars/io.mzhang.ableGo/ConcreteSyntax/ConcreteSyntax.sv b/grammars/io.mzhang.ableGo/ConcreteSyntax/ConcreteSyntax.sv
new file mode 100644
index 0000000..e69de29
diff --git a/grammars/io.mzhang.ableGo/ConcreteSyntax/Root.sv b/grammars/io.mzhang.ableGo/ConcreteSyntax/Root.sv
new file mode 100644
index 0000000..6a9776f
--- /dev/null
+++ b/grammars/io.mzhang.ableGo/ConcreteSyntax/Root.sv
@@ -0,0 +1,5 @@
+grammar io:mzhang:ableGo:ConcreteSyntax;
+
+nonterminal Root;
+
+concrete productions top::Root {}
diff --git a/grammars/io.mzhang.ableGo/ConcreteSyntax/Terminals.sv b/grammars/io.mzhang.ableGo/ConcreteSyntax/Terminals.sv
new file mode 100644
index 0000000..9a63b11
--- /dev/null
+++ b/grammars/io.mzhang.ableGo/ConcreteSyntax/Terminals.sv
@@ -0,0 +1,3 @@
+lexer class Keyword;
+
+terminal Break_t 'break' lexer classes {Keyword};