Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
584d92d302
This PR replaces the `isImplicitReducible` check with `Meta.isInstance` in the `shouldInline` function within `inlineCandidate?`. At the base phase, we skip inlining instances tagged with `[inline]`/`[always_inline]`/`[inline_if_reduce]` because their local functions will be lambda lifted during the base phase. The goal is to keep instance code compact so the lambda lifter can extract cheap-to-inline declarations. Inlining instances prematurely expands the code and creates extra work for the lambda lifter — producing many additional lambda-lifted closures. The previous check used `isImplicitReducible`, which does not capture the original intent: some `instanceReducible` declarations are not instances. `Meta.isInstance` correctly targets only actual type class instances. Although `Meta.isInstance` depends on the scoped extension state, this is safe because `shouldInline` runs during LCNF compilation at `addDecl` time — any instance referenced in the code was resolved during elaboration when the scope was active, and LCNF compilation occurs before the scope changes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> |
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