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fstar: fix F* 2026 compatibility and run Meta-F* extraction successfully

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- IEEE754.fst: fix multi-binding in assume val signatures (F* 2026 syntax),
  change float from Type0 to eqtype for equality support, generalize fma NaN
  axioms to handle any-NaN inputs (ax_fma_any_nan_y/x/z)
- FPARewriterRules.fst: add explicit #eb #sb type arguments to axiom calls
  where F* 2026 cannot infer them, use ax_fma_any_nan_y for proofs where
  y is an arbitrary NaN rather than the canonical nan constant
- RewriteCodeGen.fst: fix F* 2026 API changes: FStar.Sealed.unseal->unseal,
  C_Bool->{C_True,C_False}, List.Tot.iter->iter, FStar.Reflection.V2.inspect
  ->inspect_ln for term_view, post from C_Lemma pre->post with Tv_Abs peel,
  b2t unwrapping, lemma_ref via pack_fv instead of quote for polymorphic lemmas,
  per-branch offset tracking for Pat_Var in match branches
- .github/workflows/fstar-extract.yml: update to F* 2026.03.24 with correct
  archive name fstar-v{VERSION}-Linux-x86_64.tar.gz
- fstar/README.md and extract.sh: update version references to 2026.03.24

Extraction now produces correct output:
  expr *c, *t, *e;
  if (m().is_ite(arg1, c, t, e)) {
      result = m().mk_ite(c, m_util.mk_is_nan(t), m_util.mk_is_nan(e));
      return BR_REWRITE2;
  }

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/0a30f342-3941-4952-a54f-1bee84b022ef

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2026-04-06 01:49:41 +00:00 • committed by GitHub
parent e5acaf0c28
commit 4a2accf10c
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6 changed files with 167 additions and 108 deletions
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6
.github/workflows/fstar-extract.yml vendored
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@ -44,14 +44,14 @@ jobs:
# -----------------------------------------------------------------------
- name: Install F*
env:
FSTAR_VERSION: "2024.09.05"
FSTAR_VERSION: "2026.03.24"
run: |
ARCHIVE="fstar_v${FSTAR_VERSION}_Linux_x86_64.tar.gz"
ARCHIVE="fstar-v${FSTAR_VERSION}-Linux-x86_64.tar.gz"
URL="https://github.com/FStarLang/FStar/releases/download/v${FSTAR_VERSION}/${ARCHIVE}"
echo "Downloading F* ${FSTAR_VERSION} from ${URL}" >&2
curl -fsSL -o "/tmp/${ARCHIVE}" "${URL}"
mkdir -p "$HOME/fstar"
tar -xzf "/tmp/${ARCHIVE}" -C "$HOME/fstar" --strip-components=1
tar -xzf "/tmp/${ARCHIVE}" -C "$HOME/fstar" --strip-components=2
echo "$HOME/fstar/bin" >> "$GITHUB_PATH"
- name: Verify F* installation