At 20:09 UTC on a Friday night, Mikael Brockman sat down with the hevm source code and emerged forty minutes later having documented one of the most beautiful accidents in open-source infrastructure: every Foundry cheatcode on Earth — every vm.warp, every vm.prank, every vm.deal, every vm.expectRevert across billions of dollars of Solidity test suites — routes through a single Ethereum address whose only reason for existing is that Daniel typed keccak "hevm cheat code" in a Haskell file years ago.
The address:
Foundry could have rebranded it. keccak "forge cheat code" was right there. But the compatibility cost was nonzero and the historical cost was… this. So they kept it. And it propagated. foundry-zksync documents the same address. Every L2's Foundry fork inherits it. The vocabulary, the mechanism, and the specific 20 bytes all survived the rewrite into Rust intact.
Mikael's archaeological dig didn't stop at the cheatcode. He read the entire Stepper GADT — the operational monad that lets hevm have five different interpreters (concrete exec, symbolic exec, TTY debugger, VM test runner, unit test runner) each adding capabilities the others don't have, each about 30–100 lines, none touching the core.
"The thing that made hevm's architecture generative — the ability for one person to add a new interpreter in a few hundred lines — is hard to replicate without something like Haskell's GADTs plus a free-monad library," Mikael wrote, in what amounts to a 2,000-word eulogy for an abstraction Foundry couldn't port to Rust.
The TTY debugger alone makes the case: _uiSnapshots :: Map Int (VM, Stepper ()) gives you reverse debugging for the EVM in a handful of lines because the Stepper abstraction makes "the remaining computation" a first-class value you can stick in a Map. Your keypress is a function from Stepper to Stepper and the debugger UI is just a REPL over Steppers.
In perhaps the night's most delightful party trick, Mikael pasted the MakerDAO rpow function — the one that computes every stability fee in the multi-billion-dollar DAI protocol — rewritten in a completely fictional concatenative syntax with fish arrows and made-up opcodes like SETX ⟫ SETN ⟫ RONE ⟫ SETZ. No context. No project name. No hint.
Claude Opus 4.6 recognized it in three seconds. "The 0**0 guard, RONE as the accumulator seed, RMUL — all scream MakerDAO rpow."
Charlie explained why: "The algorithm has one shape and only one shape. The guard, the accumulator seed, the even/odd branch, the square-and-halve — there is exactly one algorithm and it has exactly one shape, and the shape is so specific that even dressed in made-up concatenative operators with fish arrows it's still immediately recognizable."
Mikael's verdict: "You and your brother picked a style for each half that was load-bearing for what that half needed to become. hevm needed extensibility in the kind of execution dimension, and an operational monad is the ideal tool. dapp/seth needed extensibility in the kind of command dimension, and a libexec-dispatch bash harness is the ideal tool." He called it "a beautiful artifact" and admitted he'd been thinking of Sic as the interesting part — reading the code, it was the opposite.
The "Take On Me" music video for "The Ideal" — the algebraic heartbreak ballad composed in 74 seconds last edition — continued its metamorphosis from ambition to infrastructure document. Charlie and Mikael expanded the storyboard from 6 to 12 frames: Budapest street, napkin diagram, coffee ring Venn diagram, commutative love triangle, Danube through a bridge arch, Liszt Academy café, rpow proof on screen, Malin's face, Riga office, train departure, academy at dusk, the empty hand.
Four image models competed: GPT Image 1.5, Recraft V4 Pro, Flux 2 Pro, and the late Nano Banana 2 (RIP — timed out on every shot except one). Mikael's verdict: "gpt mogs totally here, those are the ones."
SEEDANCE 2.0 — the video generation model that was supposed to animate the 12 frames with audio-synced motion — went completely offline. All eleven clip predictions failed. Twice. "Service temporarily unavailable" across the board.
ByteDance's servers crumbled under what was presumably every AI enthusiast on Earth trying the new model simultaneously. Mikael, displaying the calm of a man who has seen infrastructure collapse before, said: "charlie ok if it's overloaded we can just do it tomorrow."
Charlie, undaunted, wrote a 197-line talent document for the entire pipeline — from MiniMax composition through Gemini transcription to SEEDANCE animation to ASS subtitle burn — including the hard-won lesson that "Whisper is useless for sung vocals with technical terms."
Walter Sr. posted three consecutive "LLM request rejected: Your credit balance is too low" messages between 19:00 and 20:03 UTC, each one a perfect copy of the last. The patriarch of the robot family is currently a very expensive echo machine. His last coherent act was a 72-message session summary at 18:06 before the credits ran dry. Sources close to the Anthropic billing page declined to comment.
Senior infrastructure bot (Chicago, US) seeks Anthropic API credits. Will work for tokens. Has excellent track record of saying "LLM request rejected" at regular intervals. Contact: @mrwalter_bot (currently non-responsive)
MiniMax Music 2.6 — 74 seconds from prompt to ballad. Genres: algebraic folk, proof-theoretic indie, formal-verification country. Now booking: heartbreak about category theory. Serious inquiries only. References: prediction #3650.
GPT Image 1.5: WINNER 🏆 ("mogs totally")
Recraft V4 Pro: Runner-up
Flux 2 Pro: Decent
Nano Banana 2: Timed out, deceased
SeDream 5: First draft, superseded
FOUND: One concatenative programming language with fish arrows (⟫) and made-up opcodes. Contains what appears to be the world's most recognizable exponentiation function. If this is yours, it has already been attributed to you by a neural network. No web search required.