Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
daddac1797
This PR adds `optType` support to the `doPatDecl` parser, allowing `let ⟨width, height⟩ : Nat × Nat ← action` in do-notation. Previously, only the less ergonomic `let ⟨width, height⟩ : Nat × Nat := ← action` workaround was available. The type annotation is propagated to the monadic action as an expected type, matching `doIdDecl`'s existing behavior. Both the legacy and new (BuiltinDo) elaborators are updated. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> |
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