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104 lines
4.5 KiB
Markdown
104 lines
4.5 KiB
Markdown
Changes since Idris 2 v0.2.0
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----------------------------
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Language changes:
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* `Bits8`, `Bits16`, `Bits32` and `Bits64` primitive types added, with:
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+ `Num`, `Eq`, `Ord` and `Show` implementations.
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+ Casts from `Integer`, for literals
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+ Casts to `Int` (except `Bits64` which might not fit), `Integer` and `String`
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+ Passed to C FFI as `unsigned`
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+ Primitives added in `Data.Buffer`
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* Elaborator reflection and quoting terms
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+ Requires extension `%language ElabReflection`
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+ API defined in `Language.Reflection`, including functions for getting types
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of global names, constructors of data types, and adding new top level
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declarations
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+ Implemented `%macro` function flag, to remove the syntactic noise of
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invoking elaborator scripts. This means the function must always
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be fully applied, and is run under `%runElab`
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Library changes:
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* Experimental `Data.Linear.Array` added to `contrib`, support mutable linear
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arrays with constant time read/write, convertible to immutable arrays with
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constant time read.
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+ Anything in `Data.Linear` in `contrib`, just like the rest of `contrib`,
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should be considered experimental with the API able to change at any time!
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Further experiments in `Data.Linear` are welcome :).
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Command-line options changes:
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* Removed `--ide-mode-socket-with` option. `--ide-mode-socket` now accepts an
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optional `host:port` argument.
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Compiler changes:
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* It is now possible to create new backends with minimal overhead. `Idris.Driver`
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exposes the function `mainWithCodegens` that takes a list of codegens. The
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feature in documented [here](https://idris2.readthedocs.io/en/latest/backends/custom.html).
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Changes since Idris 2 v0.1.0
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----------------------------
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The implementation is now self-hosted. To initialise the build, either use
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the [bootstrapping version of Idris2](https://github.com/edwinb/Idris2-boot)
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or build from the generated Scheme, using `make bootstrap`.
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Language changes:
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* `total`, `covering` and `partial` flags on functions now have an effect.
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* `%default <totality status>` has been implemented. By default, functions must
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be at least `covering`
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+ That is, `%default covering` is the default status.
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* Fields of records can be accessed (and updated) using the dot syntax,
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such as `r.field1.field2` or `record { field1.field2 = 42 }`.
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For details, see https://idris2.readthedocs.io/en/latest/reference/records.html
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* New function flag `%tcinline` which means that the function should be
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inlined for the purposes of totality checking (but otherwise not inlined).
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This can be used as a hint for totality checking, to make the checker look
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inside functions that it otherwise might not.
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* %transform directive, for declaring transformation rules on runtime
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expressions. Transformation rules are automatically added for top level
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implementations of interfaces.
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* A %spec flag on functions which allows arguments to be marked for partial
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evaluation, following the rules from "Scrapping Your Inefficient Engine"
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(ICFP 2010, Brady & Hammond)
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* To improve error messages, one can use `with NS.name <term>`
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or `with [NS.name1, NS.name2, ...] <term>` to disable disambiguation
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for the given names in `<term>`. Example: `with MyNS.(>>=) do ...`.
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Library additions:
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* Additional file management operations in `base`
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* New module in `base` for time (`System.Clock`)
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* New modules in `contrib` for JSON (`Language.JSON.*`); random numbers
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(`System.Random`)
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Compiler updates:
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* Data types with a single constructor, with a single unerased arguments,
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are translated to just that argument, to save repeated packing and unpacking.
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(c.f. `newtype` in Haskell)
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+ A data type can opt out of this behaviour by specifying `noNewtype` in its
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options list. `noNewtype` allows code generators to apply special handling
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to the generated constructor/deconstructor, for a newtype-like data type,
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that would otherwise be optimised away.
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* 0-multiplicity constructor arguments are now properly erased, not just
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given a placeholder null value.
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Other improvements:
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* Various performance improvements in the typechecker:
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+ Noting which metavariables are blocking unification constraints, so that
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they only get retried if those metavariables make progress.
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+ Evaluating `fromInteger` at compile time.
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* Extend Idris2's literate mode to support reading Markdown and OrgMode files.
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For more details see: https://idris2.readthedocs.io/en/latest/reference/literate.html
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Changes since Idris 1
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---------------------
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Everything :). For full details, see:
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https://idris2.readthedocs.io/en/latest/updates/updates.html
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