extend Descriptor with a boolean type

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,2 +1,7 @@
 onchain/cache/
-onchain/out/
+onchain/out/
+
+offchain/target/
+
+.direnv
+.env

flake.nix

@@ -23,6 +23,9 @@
 
             # ... any other dependencies we need
             solc
+            cargo
+            rustc
+            rust-analyzer
           ];
 
           # Decorative prompt override so we know when we're in a dev shell

offchain/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "offchain"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+rand = "0.8"
+hex = "0.4"
+# ethers = { version = "2.0", features = ["abi"] }
+anyhow = "1.0"
+revm = { git = "https://github.com/bluealloy/revm.git", rev = "03ea24bd9550e93b08f343e0b410725557c1adb4", features = ["std"] }
+database = { git = "https://github.com/bluealloy/revm.git", rev = "03ea24bd9550e93b08f343e0b410725557c1adb4", package = "revm-database" }
+ethers = "2.0"
+
+
+

offchain/src/compiler/ast.rs

@@ -0,0 +1,530 @@
+// pub trait Push3Ast {
+//     /// Convert this AST into a bytecode array (Push3 tokens).
+//     fn to_bytecode(&self) -> Vec<u8>;
+
+//     // Parse an AST from bytecode (the "decompiler"), if possible.
+//     // Possibly returns a Result in case of partial/invalid parse.
+//     // fn from_bytecode(data: &[u8]) -> Self
+//     // where
+//     //     Self: Sized;
+
+//     // Randomly mutate this AST in-place (GP mutation).
+//     // fn mutate(&mut self, rng: &mut impl rand::Rng);
+
+//     // Possibly a "crossover" method, or we do it externally.
+//     // fn crossover(&self, other: &Self, rng: &mut impl rand::Rng) -> Self;
+
+//     // Evaluate the AST with some input(s).
+//     // Optionally do we want this or do we always run in EVM? 
+//     // We can stub it or do an interpret approach for local test.
+//     // fn interpret_locally(&self, inputs: &[i32]) -> Vec<i32>;
+// }
+
+
+// #[derive(Debug, Clone)]
+// pub enum TypedAst {
+//     IntLiteral(i32),
+//     Instruction(InstructionKind),
+// }
+
+// #[derive(Debug, Clone)]
+// pub enum InstructionKind {
+//     Plus(Box<TypedAst>, Box<TypedAst>),
+//     Minus(Box<TypedAst>, Box<TypedAst>),
+//     Mult(Box<TypedAst>, Box<TypedAst>),
+//     Dup,  // 0 children
+//     Pop,  // 0 children
+// }
+
+// impl Push3Ast for TypedAst {
+//     fn to_bytecode(&self) -> Vec<u8> {
+//         // do typed encoding: 
+//         // - for Plus(e1, e2): e1 -> bytecode, e2 -> bytecode, then PLUS opcode
+//         unimplemented!()
+//     }
+
+//     // fn from_bytecode(data: &[u8]) -> Self {
+//     //     // parse in a strictly typed manner; might fail or panic 
+//     //     // if the code doesn't line up properly
+//     //     unimplemented!()
+//     // }
+
+//     // fn mutate(&mut self, rng: &mut impl rand::Rng) {
+//     //     // e.g. randomly pick a node, replace it with something 
+//     //     // that respects the typed structure
+//     //     unimplemented!()
+//     // }
+
+//     // fn interpret_locally(&self, inputs: &[i32]) -> Vec<i32> {
+//     //     // do a normal expression evaluation. If a node is "Plus(a,b)",
+//     //     // interpret (a) + interpret(b).
+//     //     unimplemented!()
+//     // }
+// }
+
+// #[derive(Debug, Clone)]
+// pub enum UntypedAst {
+//     /// A single token in a list-based approach, e.g. "Integer literal"
+//     IntLiteral(i32),
+
+//     /// "Instruction" might be a simple variant with no children, 
+//     /// because the stack-based evaluation decides how many arguments it consumes.
+//     Instruction(OpCode),  
+
+//     /// A sublist of tokens, e.g. "( 2 3 DUP + )"
+//     Sublist(Vec<UntypedAst>),
+// }
+
+// /// Possibly an enum for OpCode:
+// #[derive(Debug, Clone)]
+// pub enum OpCode {
+//     Noop,
+//     Plus,
+//     Minus,
+//     Mult,
+//     Dup,
+//     Pop,
+//     // maybe Unknown => treat as no-op
+// }
+
+// // impl Push3Ast for UntypedAst {
+// //     fn to_bytecode(&self) -> Vec<u8> {
+// //         // flatten out sublists vs instructions
+// //         unimplemented!()
+// //     }
+
+// //     // fn from_bytecode(data: &[u8]) -> Self {
+// //     //     // parse "0x02 => INT_LITERAL => read next 4 bytes" 
+// //     //     // instructions might have no subchildren
+// //     //     unimplemented!()
+// //     // }
+
+// //     // fn mutate(&mut self, rng: &mut impl rand::Rng) {
+// //     //     // can randomly insert unknown tokens, reorder sublists, etc.
+// //     //     // possibly produce "invalid ops => noops"
+// //     //     unimplemented!()
+// //     // }
+
+// //     // fn interpret_locally(&self, inputs: &[i32]) -> Vec<i32> {
+// //     //     // push-based interpretation:
+// //     //     // sublist => interpret each item in sequence
+// //     //     // if an instruction sees insufficient args => no-op
+// //     //     unimplemented!()
+// //     // }
+// // }
+
+// use crate::compiler::ast::Push3Ast;
+
+// /// An untyped AST node, matching your Push3 structure.
+// #[derive(Debug, Clone)]
+// pub enum UntypedAst {
+//     /// A single integer literal.
+//     IntLiteral(i32),
+//     /// A single push instruction (no subchildren).
+//     Instruction(OpCode),
+//     /// A sublist of items, each of which is another UntypedAst.
+//     Sublist(Vec<UntypedAst>),
+// }
+
+// /// Your Push3 opcodes in an untyped form.
+// #[derive(Debug, Clone)]
+// pub enum OpCode {
+//     Noop,
+//     Plus,
+//     Minus,
+//     Mult,
+//     Dup,
+//     Pop,
+// }
+
+// /// Implementation of `Push3Ast` for `UntypedAst`.
+// ///
+// /// This will produce **bytecode** compatible with your Solidity `Push3Interpreter`:
+// /// 
+// /// - `0x00` => NOOP
+// /// - `0x01` => INTEGER_PLUS
+// /// - `0x02` => INT_LITERAL => next 4 bytes (little-endian i32)
+// /// - `0x03` => SUBLIST => next 2 bytes (big-endian `u16` length), then the sublist contents
+// /// - `0x04` => INTEGER_MINUS
+// /// - `0x05` => INTEGER_MULT
+// /// - `0x06` => INTEGER_DUP
+// /// - `0x07` => INTEGER_POP
+// ///
+// /// In the Solidity parser, `SUBLIST (0x03)` consumes two bytes to determine
+// /// how many bytes of tokens to read in that sublist.
+// impl Push3Ast for UntypedAst {
+//     /// Convert this untyped AST into a flattened push3 bytecode sequence.
+//     fn to_bytecode(&self) -> Vec<u8> {
+//         match self {
+//             UntypedAst::IntLiteral(val) => {
+//                 // 0x02 followed by 4 bytes of i32 (little-endian)
+//                 let mut bytes = Vec::with_capacity(1 + 4);
+//                 bytes.push(0x02);
+//                 bytes.extend_from_slice(&val.to_le_bytes());
+//                 bytes
+//             }
+//             UntypedAst::Instruction(op) => {
+//                 // Single opcode byte
+//                 let opcode_byte = match op {
+//                     OpCode::Noop  => 0x00,
+//                     OpCode::Plus  => 0x01,
+//                     OpCode::Minus => 0x04,
+//                     OpCode::Mult  => 0x05,
+//                     OpCode::Dup   => 0x06,
+//                     OpCode::Pop   => 0x07,
+//                 };
+//                 vec![opcode_byte]
+//             }
+//             UntypedAst::Sublist(children) => {
+//                 // 0x03 => SUBLIST
+//                 // Then 2 bytes for length (big-endian u16),
+//                 // Then the concatenated bytecode for all children.
+//                 let mut payload = Vec::new();
+//                 for child in children {
+//                     let child_bytes = child.to_bytecode();
+//                     payload.extend_from_slice(&child_bytes);
+//                 }
+//                 let sub_len = payload.len() as u16; // assume it fits in 65535
+//                 let mut bytes = Vec::with_capacity(1 + 2 + payload.len());
+//                 bytes.push(0x03);
+//                 // Store the sublist length as big-endian, because readUint16 in solidity
+//                 // does `val = uint16(word >> 240)` (effectively big-endian).
+//                 bytes.extend_from_slice(&sub_len.to_be_bytes());
+//                 // Then the actual sublist payload
+//                 bytes.extend_from_slice(&payload);
+//                 bytes
+//             }
+//         }
+//     }
+// }
+
+
+// #[derive(Debug, Clone, PartialEq)]
+// pub enum SExpr {
+//     Atom(String),          // e.g. "3", "DUP", "+"
+//     List(Vec<SExpr>),      // e.g. (3 5 +)
+// }
+
+// fn tokenize(s: &str) -> Vec<String> {
+//     let mut tokens = Vec::new();
+//     let mut current = String::new();
+
+//     for c in s.chars() {
+//         match c {
+//             '(' | ')' => {
+//                 // If we were building up an atom, push it first
+//                 if !current.trim().is_empty() {
+//                     tokens.push(current.trim().to_string());
+//                 }
+//                 current.clear();
+//                 // Then push the single-char token
+//                 tokens.push(c.to_string());
+//             }
+//             ' ' | '\t' | '\n' | '\r' => {
+//                 // Whitespace => if we have an atom, finish it
+//                 if !current.trim().is_empty() {
+//                     tokens.push(current.trim().to_string());
+//                     current.clear();
+//                 }
+//             }
+//             _ => {
+//                 // Part of an atom
+//                 current.push(c);
+//             }
+//         }
+//     }
+
+//     // If something is left in 'current' at the end
+//     if !current.trim().is_empty() {
+//         tokens.push(current.trim().to_string());
+//     }
+
+//     tokens
+// }
+
+
+// fn parse_sexpr(tokens: &[String], pos: &mut usize) -> Result<SExpr, String> {
+//     // If we’re out of tokens, error
+//     if *pos >= tokens.len() {
+//         return Err("Unexpected end of tokens".into());
+//     }
+
+//     let token = &tokens[*pos];
+//     match token.as_str() {
+//         "(" => {
+//             // Parse a list
+//             *pos += 1; // consume '('
+//             let mut list_items = Vec::new();
+
+//             while *pos < tokens.len() && tokens[*pos] != ")" {
+//                 let expr = parse_sexpr(tokens, pos)?;
+//                 list_items.push(expr);
+//             }
+
+//             if *pos >= tokens.len() {
+//                 return Err("Missing closing parenthesis".into());
+//             }
+//             // consume ")"
+//             *pos += 1;
+//             Ok(SExpr::List(list_items))
+//         }
+//         ")" => {
+//             // Should never parse_sexpr starting with ')'
+//             Err("Unexpected ')'".into())
+//         }
+//         _ => {
+//             // Atom
+//             let atom_str = token.clone();
+//             *pos += 1;
+//             Ok(SExpr::Atom(atom_str))
+//         }
+//     }
+// }
+
+// /// Parse an entire string into a single top-level `SExpr`.
+// fn parse_string_to_sexpr(s: &str) -> Result<SExpr, String> {
+//     let tokens = tokenize(s);
+//     let mut pos = 0;
+//     let expr = parse_sexpr(&tokens, &mut pos)?;
+
+//     // If there's leftover tokens, optionally check
+//     if pos < tokens.len() {
+//         return Err(format!("Extra tokens after parse: {:?}", &tokens[pos..]));
+//     }
+
+//     Ok(expr)
+// }
+
+// fn sexpr_to_untyped(expr: &SExpr) -> Result<UntypedAst, String> {
+//     match expr {
+//         SExpr::Atom(text) => {
+//             // 1) try to parse as i32
+//             if let Ok(val) = text.parse::<i32>() {
+//                 Ok(UntypedAst::IntLiteral(val))
+//             } else {
+//                 // 2) otherwise parse as OpCode symbol
+//                 match text.to_uppercase().as_str() {
+//                     "+" => Ok(UntypedAst::Instruction(OpCode::Plus)),
+//                     "-" => Ok(UntypedAst::Instruction(OpCode::Minus)),
+//                     "*"  => Ok(UntypedAst::Instruction(OpCode::Mult)),
+//                     "DUP" => Ok(UntypedAst::Instruction(OpCode::Dup)),
+//                     "POP" => Ok(UntypedAst::Instruction(OpCode::Pop)),
+//                     // more opcodes ...
+//                     _ => Ok(UntypedAst::Instruction(OpCode::Noop))
+//                 }
+//             }
+//         }
+//         SExpr::List(list) => {
+//             // parse each child into UntypedAst
+//             let mut result = Vec::new();
+//             for child in list {
+//                 result.push(sexpr_to_untyped(child)?);
+//             }
+//             Ok(UntypedAst::Sublist(result))
+//         }
+//     }
+// }
+
+// src/compiler/ast.rs
+
+pub trait Push3Ast {
+    /// Convert this AST into a bytecode array (Push3 tokens).
+    fn to_bytecode(&self) -> Vec<u8>;
+}
+
+/* --------------------------------------------
+   1) TypedAst stubs (optional)
+-------------------------------------------- */
+
+#[derive(Debug, Clone)]
+pub enum TypedAst {
+    IntLiteral(i32),
+    Instruction(InstructionKind),
+}
+
+#[derive(Debug, Clone)]
+pub enum InstructionKind {
+    Plus(Box<TypedAst>, Box<TypedAst>),
+    Minus(Box<TypedAst>, Box<TypedAst>),
+    Mult(Box<TypedAst>, Box<TypedAst>),
+    Dup,
+    Pop,
+}
+
+// Example stub; not fully implemented
+impl Push3Ast for TypedAst {
+    fn to_bytecode(&self) -> Vec<u8> {
+        unimplemented!("TypedAst::to_bytecode not yet implemented");
+    }
+}
+
+/* --------------------------------------------
+   2) UntypedAst + OpCode
+-------------------------------------------- */
+
+#[derive(Debug, Clone)]
+pub enum UntypedAst {
+    IntLiteral(i32),
+    Instruction(OpCode),
+    Sublist(Vec<UntypedAst>),
+}
+
+#[derive(Debug, Clone)]
+pub enum OpCode {
+    Noop,
+    Plus,
+    Minus,
+    Mult,
+    Dup,
+    Pop,
+}
+
+/// Implementation of `Push3Ast` for `UntypedAst`.
+/// Matches the Solidity-based Push3Interpreter token IDs.
+impl Push3Ast for UntypedAst {
+    fn to_bytecode(&self) -> Vec<u8> {
+        match self {
+            UntypedAst::IntLiteral(val) => {
+                // 0x02 => INT_LITERAL => next 4 bytes (little-endian i32)
+                let mut bytes = Vec::with_capacity(1 + 4);
+                bytes.push(0x02);
+                bytes.extend_from_slice(&val.to_be_bytes());
+                bytes
+            }
+            UntypedAst::Instruction(op) => {
+                let opcode_byte = match op {
+                    OpCode::Noop  => 0x00,
+                    OpCode::Plus  => 0x01,
+                    OpCode::Minus => 0x04,
+                    OpCode::Mult  => 0x05,
+                    OpCode::Dup   => 0x06,
+                    OpCode::Pop   => 0x07,
+                };
+                vec![opcode_byte]
+            }
+            UntypedAst::Sublist(children) => {
+                // 0x03 => SUBLIST => next 2 bytes = big-endian length, then sub-payload
+                let mut payload = Vec::new();
+                for child in children {
+                    payload.extend(child.to_bytecode());
+                }
+                let sub_len = payload.len() as u16;
+                let mut bytes = Vec::with_capacity(1 + 2 + payload.len());
+                bytes.push(0x03);
+                bytes.extend_from_slice(&sub_len.to_be_bytes()); // big-endian
+                bytes.extend_from_slice(&payload);
+                bytes
+            }
+        }
+    }
+}
+
+/* --------------------------------------------
+   3) S-expression parsing helpers
+-------------------------------------------- */
+#[derive(Debug, Clone, PartialEq)]
+pub enum SExpr {
+    Atom(String),
+    List(Vec<SExpr>),
+}
+
+pub fn tokenize(s: &str) -> Vec<String> {
+    let mut tokens = Vec::new();
+    let mut current = String::new();
+
+    for c in s.chars() {
+        match c {
+            '(' | ')' => {
+                if !current.trim().is_empty() {
+                    tokens.push(current.trim().to_string());
+                }
+                current.clear();
+                tokens.push(c.to_string());
+            }
+            ' ' | '\t' | '\n' | '\r' => {
+                if !current.trim().is_empty() {
+                    tokens.push(current.trim().to_string());
+                    current.clear();
+                }
+            }
+            _ => {
+                current.push(c);
+            }
+        }
+    }
+
+    if !current.trim().is_empty() {
+        tokens.push(current.trim().to_string());
+    }
+
+    tokens
+}
+
+fn parse_sexpr_internal(tokens: &[String], pos: &mut usize) -> Result<SExpr, String> {
+    if *pos >= tokens.len() {
+        return Err("Unexpected end of tokens".into());
+    }
+
+    let token = &tokens[*pos];
+    match token.as_str() {
+        "(" => {
+            *pos += 1; // consume '('
+            let mut items = Vec::new();
+            while *pos < tokens.len() && tokens[*pos] != ")" {
+                let expr = parse_sexpr_internal(tokens, pos)?;
+                items.push(expr);
+            }
+            if *pos >= tokens.len() {
+                return Err("Missing closing parenthesis".into());
+            }
+            *pos += 1; // consume ')'
+            Ok(SExpr::List(items))
+        }
+        ")" => {
+            Err("Unexpected ')'".into())
+        }
+        _ => {
+            let atom = token.clone();
+            *pos += 1;
+            Ok(SExpr::Atom(atom))
+        }
+    }
+}
+
+/// Parse an entire string into a single top-level `SExpr`.
+pub fn parse_string_to_sexpr(s: &str) -> Result<SExpr, String> {
+    let tokens = tokenize(s);
+    let mut pos = 0;
+    let expr = parse_sexpr_internal(&tokens, &mut pos)?;
+    if pos < tokens.len() {
+        return Err(format!("Extra tokens after parse: {:?}", &tokens[pos..]));
+    }
+    Ok(expr)
+}
+
+/// Convert an SExpr => UntypedAst
+pub fn sexpr_to_untyped(expr: &SExpr) -> Result<UntypedAst, String> {
+    match expr {
+        SExpr::Atom(text) => {
+            if let Ok(val) = text.parse::<i32>() {
+                Ok(UntypedAst::IntLiteral(val))
+            } else {
+                match text.to_uppercase().as_str() {
+                    "+"   => Ok(UntypedAst::Instruction(OpCode::Plus)),
+                    "-"   => Ok(UntypedAst::Instruction(OpCode::Minus)),
+                    "*"   => Ok(UntypedAst::Instruction(OpCode::Mult)),
+                    "DUP" => Ok(UntypedAst::Instruction(OpCode::Dup)),
+                    "POP" => Ok(UntypedAst::Instruction(OpCode::Pop)),
+                    _     => Ok(UntypedAst::Instruction(OpCode::Noop)),
+                }
+            }
+        }
+        SExpr::List(items) => {
+            let mut sub_asts = Vec::new();
+            for child in items {
+                sub_asts.push(sexpr_to_untyped(child)?);
+            }
+            Ok(UntypedAst::Sublist(sub_asts))
+        }
+    }
+}

offchain/src/compiler/mod.rs

@@ -0,0 +1 @@
+pub mod ast;

offchain/src/evm_integration/mod.rs

@@ -0,0 +1 @@
+pub mod revm_runner;

offchain/src/gp/genetic_ops.rs

@@ -0,0 +1,10 @@
+// use crate::compiler::ast::{Expr};
+
+// pub fn crossover(a: &Expr, b: &Expr) -> (Expr, Expr) {
+//     // stub
+//     (a.clone(), b.clone())
+// }
+
+// pub fn mutate(expr: &mut Expr) {
+//     // stub
+// }

offchain/src/gp/mod.rs

@@ -0,0 +1,13 @@
+pub mod population;
+pub mod genetic_ops;
+// pub mod fitness;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_dummy() {
+        assert_eq!(2+2, 4);
+    }
+}

offchain/src/gp/population.rs

@@ -0,0 +1,9 @@
+#[derive(Debug, Clone)]
+pub struct Individual {
+    pub fitness: f64,
+    // your Expr or bytecode or both
+}
+
+pub struct Population {
+    pub individuals: Vec<Individual>,
+}

onchain/src/Push3Interpreter.sol

@@ -9,6 +9,11 @@ import "forge-std/console.sol";
  *      a token-based bytecode approach.
  */
 contract Push3Interpreter {
+    // -----------------------------------------------------
+    // 0. CONSTANTS
+    // -----------------------------------------------------
+    uint8 internal constant OPCODE_BOOL_OFFSET = 0x6;
+
     // -----------------------------------------------------
     // 1. ENUMS
     // -----------------------------------------------------
@@ -16,16 +21,34 @@ contract Push3Interpreter {
         NO_TAG,       // 0
         INSTRUCTION,  // 1
         INT_LITERAL,  // 2
-        SUBLIST       // 3
+        SUBLIST,      // 3
+        BOOL_LITERAL  // 4
     }
 
     enum OpCode {
-        NOOP,          // 0
-        INTEGER_PLUS,  // 1
-        INTEGER_MINUS, // 2
-        INTEGER_MULT,  // 3
-        INTEGER_DUP,   // 4
-        INTEGER_POP    // 5
+        NOOP,            // 0
+        INTEGER_PLUS,    // 1
+        INTEGER_MINUS,   // 2
+        INTEGER_MULT,    // 3
+        INTEGER_DUP,     // 4
+        INTEGER_POP,     // 5
+        BOOL_DUP,        // OPCODE_BOOL_OFFSET + 0
+        BOOL_POP,        // OPCODE_BOOL_OFFSET + 1
+        BOOL_SWAP,       // OPCODE_BOOL_OFFSET + 2
+        BOOL_FLUSH,      // OPCODE_BOOL_OFFSET + 3
+        BOOL_STACKDEPTH, // OPCODE_BOOL_OFFSET + 4
+        BOOL_NOT,        // OPCODE_BOOL_OFFSET + 5
+        BOOL_AND,        // OPCODE_BOOL_OFFSET + 6
+        BOOL_OR,         // OPCODE_BOOL_OFFSET + 7
+        BOOL_EQ,         // OPCODE_BOOL_OFFSET + 8
+        BOOL_FROMFLOAT,  // OPCODE_BOOL_OFFSET + 9
+        BOOL_FROMINTEGER,// OPCODE_BOOL_OFFSET + 10
+        BOOL_ROT,        // OPCODE_BOOL_OFFSET + 11
+        BOOL_SHOVE,      // OPCODE_BOOL_OFFSET + 12
+        BOOL_YANK,       // OPCODE_BOOL_OFFSET + 13
+        BOOL_YANKDUP,    // OPCODE_BOOL_OFFSET + 14
+        BOOL_DEFINE,     // OPCODE_BOOL_OFFSET + 15
+        BOOL_RAND        // OPCODE_BOOL_OFFSET + 16
     }
 
     // -----------------------------------------------------
@@ -85,11 +108,21 @@ contract Push3Interpreter {
         return makeDescriptor(CodeTag.INT_LITERAL, 0, 0, masked);
     }
 
+    function makeBoolLiteral(bool val) internal pure returns (uint256) {
+        uint256 masked;
+        if (val) masked = uint256(1);
+        return makeDescriptor(CodeTag.BOOL_LITERAL, 0, 0, masked);
+    }
+
     function extractInt32(uint256 desc) internal pure returns (int32) {
         // read the low 32 bits
         return int32(uint32(getLow184(desc)));
     }
 
+    function extractBool(uint256 desc) internal pure returns (bool) {
+        return desc & 1 == 1;
+    }
+
     // -----------------------------------------------------
     // 3. HELPER READS
     // -----------------------------------------------------

onchain/test/Push3Interpreter.t.sol

@@ -43,7 +43,7 @@ contract Push3InterpreterTest is Test {
         //  [9..12] = 0x00000020 => 32
         //  [13] = 0x01 => plus
 
-        bytes memory code = hex"03000B020000000A020000002001";        
+        bytes memory code = hex"03000B020000000A020000002001";
 
         // Or fully concatenated:
         // 0x03 00 0B 02 00 00 00 0A 02 00 00 00 20 01