13e2a0291c
This will make it more straightforward to check automatically that the release notes in the repository match the release notes on github.
21 lines
2.1 KiB
Markdown
21 lines
2.1 KiB
Markdown
v4.1.0
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---------
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* The error positioning on missing tokens has been [improved](https://github.com/leanprover/lean4/pull/2393). In particular, this should make it easier to spot errors in incomplete tactic proofs.
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* After elaborating a configuration file, Lake will now cache the configuration to a `lakefile.olean`. Subsequent runs of Lake will import this OLean instead of elaborating the configuration file. This provides a significant performance improvement (benchmarks indicate that using the OLean cuts Lake's startup time in half), but there are some important details to keep in mind:
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+ Lake will regenerate this OLean after each modification to the `lakefile.lean` or `lean-toolchain`. You can also force a reconfigure by passing the new `--reconfigure` / `-R` option to `lake`.
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+ Lake configuration options (i.e., `-K`) will be fixed at the moment of elaboration. Setting these options when `lake` is using the cached configuration will have no effect. To change options, run `lake` with `-R` / `--reconfigure`.
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+ **The `lakefile.olean` is a local configuration and should not be committed to Git. Therefore, existing Lake packages need to add it to their `.gitignore`.**
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* The signature of `Lake.buildO` has changed, `args` has been split into `weakArgs` and `traceArgs`. `traceArgs` are included in the input trace and `weakArgs` are not. See Lake's [FFI example](src/lake/examples/ffi/lib/lakefile.lean) for a demonstration of how to adapt to this change.
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* The signatures of `Lean.importModules`, `Lean.Elab.headerToImports`, and `Lean.Elab.parseImports`
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have [changed](https://github.com/leanprover/lean4/pull/2480) from taking `List Import` to `Array Import`.
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* There is now [an `occs` field](https://github.com/leanprover/lean4/pull/2470)
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in the configuration object for the `rewrite` tactic,
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allowing control of which occurrences of a pattern should be rewritten.
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This was previously a separate argument for `Lean.MVarId.rewrite`,
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and this has been removed in favour of an additional field of `Rewrite.Config`.
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It was not previously accessible from user tactics.
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