13e2a0291c
This will make it more straightforward to check automatically that the release notes in the repository match the release notes on github.
77 lines
4.7 KiB
Markdown
77 lines
4.7 KiB
Markdown
v4.5.0
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---------
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* Modify the lexical syntax of string literals to have string gaps, which are escape sequences of the form `"\" newline whitespace*`.
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These have the interpretation of an empty string and allow a string to flow across multiple lines without introducing additional whitespace.
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The following is equivalent to `"this is a string"`.
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```lean
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"this is \
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a string"
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```
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[PR #2821](https://github.com/leanprover/lean4/pull/2821) and [RFC #2838](https://github.com/leanprover/lean4/issues/2838).
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* Add raw string literal syntax. For example, `r"\n"` is equivalent to `"\\n"`, with no escape processing.
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To include double quote characters in a raw string one can add sufficiently many `#` characters before and after
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the bounding `"`s, as in `r#"the "the" is in quotes"#` for `"the \"the\" is in quotes"`.
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[PR #2929](https://github.com/leanprover/lean4/pull/2929) and [issue #1422](https://github.com/leanprover/lean4/issues/1422).
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* The low-level `termination_by'` clause is no longer supported.
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Migration guide: Use `termination_by` instead, e.g.:
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```diff
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-termination_by' measure (fun ⟨i, _⟩ => as.size - i)
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+termination_by i _ => as.size - i
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```
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If the well-founded relation you want to use is not the one that the
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`WellFoundedRelation` type class would infer for your termination argument,
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you can use `WellFounded.wrap` from the std library to explicitly give one:
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```diff
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-termination_by' ⟨r, hwf⟩
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+termination_by x => hwf.wrap x
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```
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* Support snippet edits in LSP `TextEdit`s. See `Lean.Lsp.SnippetString` for more details.
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* Deprecations and changes in the widget API.
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- `Widget.UserWidgetDefinition` is deprecated in favour of `Widget.Module`. The annotation `@[widget]` is deprecated in favour of `@[widget_module]`. To migrate a definition of type `UserWidgetDefinition`, remove the `name` field and replace the type with `Widget.Module`. Removing the `name` results in a title bar no longer being drawn above your panel widget. To add it back, draw it as part of the component using `<details open=true><summary class='mv2 pointer'>{name}</summary>{rest_of_widget}</details>`. See an example migration [here](https://github.com/leanprover/std4/pull/475/files#diff-857376079661a0c28a53b7ff84701afabbdf529836a6944d106c5294f0e68109R43-R83).
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- The new command `show_panel_widgets` allows displaying always-on and locally-on panel widgets.
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- `RpcEncodable` widget props can now be stored in the infotree.
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- See [RFC 2963](https://github.com/leanprover/lean4/issues/2963) for more details and motivation.
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* If no usable lexicographic order can be found automatically for a termination proof, explain why.
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See [feat: GuessLex: if no measure is found, explain why](https://github.com/leanprover/lean4/pull/2960).
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* Option to print [inferred termination argument](https://github.com/leanprover/lean4/pull/3012).
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With `set_option showInferredTerminationBy true` you will get messages like
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```
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Inferred termination argument:
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termination_by
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ackermann n m => (sizeOf n, sizeOf m)
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```
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for automatically generated `termination_by` clauses.
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* More detailed error messages for [invalid mutual blocks](https://github.com/leanprover/lean4/pull/2949).
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* [Multiple](https://github.com/leanprover/lean4/pull/2923) [improvements](https://github.com/leanprover/lean4/pull/2969) to the output of `simp?` and `simp_all?`.
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* Tactics with `withLocation *` [no longer fail](https://github.com/leanprover/lean4/pull/2917) if they close the main goal.
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* Implementation of a `test_extern` command for writing tests for `@[extern]` and `@[implemented_by]` functions.
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Usage is
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```
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import Lean.Util.TestExtern
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test_extern Nat.add 17 37
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```
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The head symbol must be the constant with the `@[extern]` or `@[implemented_by]` attribute. The return type must have a `DecidableEq` instance.
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Bug fixes for
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[#2853](https://github.com/leanprover/lean4/issues/2853), [#2953](https://github.com/leanprover/lean4/issues/2953), [#2966](https://github.com/leanprover/lean4/issues/2966),
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[#2971](https://github.com/leanprover/lean4/issues/2971), [#2990](https://github.com/leanprover/lean4/issues/2990), [#3094](https://github.com/leanprover/lean4/issues/3094).
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Bug fix for [eager evaluation of default value](https://github.com/leanprover/lean4/pull/3043) in `Option.getD`.
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Avoid [panic in `leanPosToLspPos`](https://github.com/leanprover/lean4/pull/3071) when file source is unavailable.
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Improve [short-circuiting behavior](https://github.com/leanprover/lean4/pull/2972) for `List.all` and `List.any`.
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Several Lake bug fixes: [#3036](https://github.com/leanprover/lean4/issues/3036), [#3064](https://github.com/leanprover/lean4/issues/3064), [#3069](https://github.com/leanprover/lean4/issues/3069).
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