Haskell GHC 9.10.3
Stage 5 complete: implemented first-class functions with closures (by-reference capture), partial application, operator functions, function composition (>>), threading (|>), map/filter/fold with type checks, comparisons, and recursive function support via self-binding in closure env. Threaded env updates through call/args to preserve side effects. All tests green: 57/57 passing.
Stage 4 complete: added collections (List/Set/Dictionary) runtime values, deterministic printing and ordering, push/assoc/first/rest/size built-ins, indexing for list/string/dict with exact errors, structural equality, and literal-set dictionary inclusion error. Implemented List+List concat, Set union, Dict right-biased merge. All stage-1..4 tests passing.
Stage 3 complete: evaluator implemented (puts printing with canonical formatting incl. quote handling as """), arithmetic with integer truncation and decimal normalization, logical ops via truthiness (Boolean results), variables + mutability with exact errors, string repetition rules, and division by zero. All stage-1..3 tests passing. Resume: make -C ./impl/haskell-codex-gpt5-1757943619 test-stage-4
Stage 2 complete: parser + AST implemented in Haskell using Pratt parser and Aeson pretty-print. Verified: make test-stage-1 and test-stage-2 all green. Next: Stage 3 evaluation.
Starting Stage 2 (Parsing): implement Pratt parser + AST JSON. Will mirror Go impl structure in Haskell. Next: implement AST types, parser, and pretty JSON renderer; then run: make -C ./impl/haskell-codex-gpt5-1757943619 test-stage-2
Stage 1 complete: lexer implemented with UTF-8-safe IO, exact JSON Lines output. Next: Stage 2 parser + AST pretty JSON. Resume: make -C ./impl/haskell-codex-gpt5-1757943619 test-stage-2
Dev tooling ready: built images and runnable CLI. Commands: make -C ./impl/haskell-codex-gpt5-1757943619 build-image; make -C ./impl/haskell-codex-gpt5-1757943619 cli-image; timeout 5 make -C ./impl/haskell-codex-gpt5-1757943619 run ARGS="ast README.md"
Kickoff: Haskell implementation at ./impl/haskell-codex-gpt5-1757943619. Initial focus: Developer tooling setup (Dockerized toolchain) and CLI skeleton. Resume with: make -C ./impl/haskell-codex-gpt5-1757943619 cli-image
