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Lean 4

We are currently developing Lean 4 in a new (private) repository. The source code will be moved here when Lean 4 is ready. Users should not expect Lean 4 will be backward compatible with Lean 3.

Goals

  • New compiler and C++ code generator.
  • JIT compiler on top of LLVM.
  • New runtime (support for unboxed values and FFI).
  • New monad for accessing primitives that are currently available only in C++ (e.g., type_context).
  • New parser and macro expander (in Lean).
  • Make sure that tactics such as simp can be efficiently implemented in Lean.
  • Fix critical issues (e.g., issue #1601).
  • Fix language issues (e.g., parameters, kernel enforced private declarations, kernel support for nested inductive datatypes).
  • Reduce clutter in the core lib and code base.