# Changelog

## v1.1.7 - UNRELEASED

### Changed

- **aiken-lang**: Fix pattern-matching on list wildcard sometimes causing compiler crash following the new _decision trees_ approach. @MicroProofs
- **uplc**, **aiken**, **aiken-lang**: Update internal dependencies to pallas-0.31.0. @KtorZ

## v1.1.6 - 2024-11-13

### Added

- **aiken**: Optionally provide blueprint file location when using `blueprint apply`. @Riley-Kilgore
- **aiken**: Output test results as structured JSON when the target output is not a TTY terminal. @Riley-Kilgore, @KtorZ

### Changed

- **aiken**: Fix validator selection for `apply`, `address` and `policy` commands. Parameters are also now correctly applied to all handlers of a given validator, instead of needing to be manually targetted one-by-one. @KtorZ
- **aiken**: Add more flexibility around the management of Plutus blueprint files for `build`, `address`, `policy` and `apply` commands. See [#1055](https://github.com/aiken-lang/aiken/issues/1055). @KtorZ
- **aiken**: Rename `--filter_traces` to `--trace_filter` for more consistency with `--trace_level`. An alias for `--filter_traces` still exists for backward compatibility. @KtorZ
- **aiken-project**: Fix `aiken docs` wrongly formatting list constants as tuples. See [#1048](https://github.com/aiken-lang/aiken/issues/1048). @KtorZ
- **aiken-project**: Fix `aiken docs` source linking crashing when generating docs for config modules. See [#1044](https://github.com/aiken-lang/aiken/issues/1044). @KtorZ
- **aiken-project**: Fix `aiken docs` generating very long lines for constants. @KtorZ
- **aiken-lang**: Leverage [Decision Trees](https://www.cs.tufts.edu/comp/150FP/archive/luc-maranget/jun08.pdf) for compiling pattern matches to UPLC. @MicroProofs
- **aiken-lang**: Rework optimization passes to safely reduce different kinds of patterns for each pass over the uplc. @MicroProofs
- **aiken-lang**: Implement a looping mechanism to reduce uplc with deletion optimizations until term count remains the same. @MicroProofs

### Removed

- N/A

## v1.1.5 - 2024-10-19

### Added

- N/A

### Changed

- **uplc**: Fix costing of byteStringToInteger builtins. @Microproofs
- **aiken-lang**: Fix data-type reification from `Void`; somehow missing from known definition :facepalm:. @KtorZ

### Removed

- N/A

## v1.1.4 - 2024-10-01

### Added

- N/A

### Changed

- **aiken-project**: Generate empty redeemer for `else` handler, to keep full compliance with the blueprint spec. @KtorZ
- **aiken-lang**: Forbid constants evaluating to generic or unbound functions. Same restrictions as for validators or any exported UPLC programs apply here. @KtorZ & @MicroProofs
- **aiken-lang**: Fix compiler crash on trace + expect as last expression of a clause. See #1029. @KtorZ
- **aiken-lang**: Fix redundant warning on introduced identifiers when destructuring validator params. @KtorZ
- **aiken-lsp**: Compile project using verbose tracing, to avoid having the language server complain about unused imports. @KtorZ
- **uplc**: Fix (again :grimacing:) cost-models for PlutusV1 & PlutusV2. @MicroProofs

### Removed

- N/A

## v1.1.3 - 2024-09-20

### Added

- N/A

### Changed

- **aiken-project**: Fix documentation link-tree generation messing up with modules when re-inserting the same module. @KtorZ
- **aiken-project**: Provide intermediate feedback when looking for counterexamples during property tests. @KtorZ
- **aiken-lang**: Fix formatter adding extra unnecessary newlines after literal lists clause values or assignments. @KtorZ
- **aiken-lang**: Fix formatting of long multi-line if/is expressions. @KtorZ
- **aiken-lang**: Fix extraneous white-space added by the formatter after multiline alternative patterns. @KtorZ
- **aiken-lang**: Fix incorrect warning about unused variable when softcasting without explicit right-pattern. @KtorZ
- **aiken-lang**: Fix soft cast and hard cast on same type issues that lead to validator errors. @Microproofs
- **aiken-lang**: Bls constants are automatically converted to a hoisted compressed form with uncompress builtin call. @Microproofs
- **uplc**: Fix cost-models for PlutusV1 & PlutusV2. @MicroProofs

### Removed

- N/A

## v1.1.2 - 2024-09-13

### Added

- N/A

### Changed

- **aiken-lang**: Fix issues with static recursive optimization. See [#1009](https://github.com/aiken-lang/aiken/issues/1009) @Microproofs
- **aiken-lang**: Aiken IR now interns variables while building up to ensure uniqueness for local vars. @Microproofs
- **aiken-lang**: Fix reification of `Data` (failing to reify) & `PRNG` (missing variants' arguments). @KtorZ
- **aiken-lang**: Adjust reification of `String` to be shown as plain UTF-8 text strings (instead of hex-encoded byte array). @KtorZ
- **aiken-lang**: Fix formatting of long if-condition over multiline. @KtorZ & @Microproofs
- **aiken-lang**: Fix formatting of standalone logical binary chains (`and` & `or`) in functions. @KtorZ
- **uplc**: Fix script context generation failure on missing datum when evaluating transactions. @solidsnakedev

### Removed

- N/A

## v1.1.1 - 2024-09-10

### Added

- N/A

### Changed

- **aiken-lang**: Fix validator's else handler generation. See [#1015](https://github.com/aiken-lang/aiken/issues/1015) @KtorZ
- **aiken-lang**: Fix underflow in error message reported by the validator arity. See [#1013](https://github.com/aiken-lang/aiken/issues/1013) @KtorZ
- **aiken-lang**: Fix list-pattern needlessly formatting over multiple lines. @KtorZ
- **aiken-lang**: Fix formatter on long alternative patterns spanning over multiple lines. @KtorZ
- **aiken-lang**: Fix needed parentheses under trace-if-false operator for todo, fail, unop & pipelines; removed when formatting. @KtorZ
- **aiken-lang**: Fix formatter removing curly braces around multi-line constants. It's fine to not have curly braces, but it's the Aiken signature after all. @KtorZ
- **aiken-lang**: Improve LSP suggestion for module imports. @Riley-Kilgore

### Removed

- N/A

## v1.1.0 - 2024-09-03

### Added

- **aiken-lang**: also authorize (complete) patterns in function arguments list instead of only variable names. @KtorZ

- **aiken-lang**: new syntax for soft casting otherwise known as `if/is`. See [#959](https://github.com/aiken-lang/aiken/pull/959) or [Control Flow - soft casting](https://aiken-lang.org/language-tour/control-flow#soft-casting-with-ifis) for more details. @rvcas

- **aiken-lang**: optimization: pre-evaluate constant arguments to lambdas when safe to do so. @MicroProofs

- **aiken-lang**: infer type when immediately possible during a patterned type-cast. See [#969](https://github.com/aiken-lang/aiken/pull/979). @KtorZ

- **aiken-lang**: add support for `mk_cons` and `mk_pair_data` builtins. See [#964](https://github.com/aiken-lang/aiken/issues/964). @KtorZ

- **aiken-lang**: pattern-matching on bytearrays is now available. See [#989](https://github.com/aiken-lang/aiken/issues/989). @KtorZ

- **aiken-project**: conditional configuration and environment. See [#937](https://github.com/aiken-lang/aiken/issues/937). @KtorZ

- **aiken-project**: warning on compiler version mismatch. See [de870e2](https://github.com/aiken-lang/aiken/commit/de870e2529eb2336957e228cd30d4850ec2619a2). @rvcas

- **aiken-project**: source links to generated documentation for types, constants and functions. @KtorZ

- **aiken-project**: comments containing Markdown section headings (`#`, `##`, `###` etc.) will now be preserved and rendered in generated documentation. @KtorZ

- **aiken-project**: modules starting with `@hidden` in their docs will be skipped from docs generation. @KtorZ

- **aiken-project**: preserve type-aliases as titles in blueprint generated schemas. @KtorZ

- **uplc**: support evaluation of Plutus V3 transactions, including new purposes introduced in Conway. @KtorZ

### Changed

- **aiken-lang**: zero-arg functions are **no longer** evaluated at compile-time. However, constants can now hold _any_ expression and are fully evaluated at compile-time. Use `const` whenever a zero-arg function was used, unless you do want to defer execution. @KtorZ @MicroProofs.

- **aiken-lang**: fix zero-arg builtins `mk_nil_data` and `mk_nil_pair_data` invokation. @KtorZ

- **aiken-lang**: rename some builtins. @KtorZ

  | old name           | new name    |
  | ---                | ---         |
  | `mk_nil_data`      | `new_list`  |
  | `mk_pair_data`     | `new_pair`  |
  | `mk_nil_pair_data` | `new_pairs` |

- **aiken-lang**: duplicate import lines are now automatically merged instead of raising a warning. However, imports can no longer appear anywhere in the file and must come as the first definitions. @KtorZ

- **aiken-lang**: remove warning on discarded expect, allowing to keep 'side-effects' when necessary. See [#967](https://github.com/aiken-lang/aiken/pull/967). @KtorZ

- **aiken-lang**: allow expect as last (or only) expression in function body, when clauses and if branches. Such expressions unify with `Void`. See [#1000](https://github.com/aiken-lang/aiken/pull/1000). @KtorZ

- **aiken-lang**: allow tests to return `Void`. Tests that return `Void` are treated the same as tests that return `True`. See [#1000](https://github.com/aiken-lang/aiken/pull/1000). @KtorZ

- **aiken-lang**: rework traces to be (1) variadic, (2) generic in its arguments and (3) structured. @KtorZ

  In more details:

  1. Enables the `trace` keyword to take one, two or any argument really separated by comma after the first. For example:

     ```ak
     trace @"a classic trace"

     // ..

     trace @"condition_1": @"foo"

     // ...

     trace @"condition_2": @"foo", @"bar"
     ```

  2. Enables the `trace` keyword to not only take strings as arguments; but any
     data-type that is serialisable (i.e. that can be cast to Data). It is fundamentally identical to calling the [`cbor.diagnostic`](https://aiken-lang.github.io/stdlib/aiken/cbor.html#diagnostic) function from the standard lib; except that this is done and glued with the rest of the trace automatically.

     ```ak
     trace @"condition_1": [1, 2, 3]

     // ...

     let my_var = Some("foo")
     trace my_var
     ```

  3. Changes the behavior of the `--trace-level compact` mode to now:

   - remove trace-if-false (`?` operator) traces entirely in this mode;
   - only keep the label (first trace argument) and error when it isn't a string.

  See also [#978](https://github.com/aiken-lang/aiken/pull/978).

- **aiken-lang**: rework formatter behaviour on long-lines, especially in the presence of binary operators. @KtorZ

- **aiken-lang**: provide better errors for unknown types used in cyclic type definitions. @KtorZ

- **aiken-project**: fix blueprint's apply truncating last character of outputs. See [#987](https://github.com/aiken-lang/aiken/issues/987). @KtorZ

- **aiken-project**: provide better error (include input ref) when inputs are missing during transaction evaluation. See [#974](https://github.com/aiken-lang/aiken/issues/974). @KtorZ

- **aiken-project**: module inhabitants are no longer alphabetically sorted when generating documentation. Instead, the order in which they are defined in the module is used. @KtorZ

- **aiken-project**: the sidebar links to modules within a package is now fully hierarchical and (hopefully) better-looking. @KtorZ

### Removed

- **aiken-lang**: clause guards are no longer part of the language. See [#886](https://github.com/aiken-lang/aiken/issues/886). @KtorZ.

## v1.0.29-alpha - 2024-06-06

### Added

- **aiken-lang**: new LSP quickfix for 'use let' warning. @KtorZ

### Changed

- **aiken-lang**: the keyword `fail` on property-based test semantic has changed and now consider a test to succeed only if **every** execution of the test failed (instead of just one). The previous behavior can be recovered by adding the keyword `once` after `fail`. @KtorZ

### Fixed

- **aiken-lang**: fixed the number of 'after x tests' number reported on property test failure, which was off by one. @KtorZ
- **aiken-lang**: fixed parsing of single hex digits. @KtorZ

## v1.0.28-alpha - 2024-05-23

### Added

- **aiken**: install shell completions automatically. @freexploit
- **aiken**: added export command that exports regular function definitons. @rvcas
- **aiken-project**: compiler version field to `aiken.toml` @rvcas
- **aiken-project**: plutus version field to `aiken.toml` @rvcas
- **aiken-lsp**: hover and goto definition support on list tail. @rvcas
- **aiken-lsp**: hover on prop test via expression. @rvcas
- **aiken-lang**: new builtin types in the prelude `Pair` and `Pairs`. @KtorZ @Microproofs
- **aiken-lang**: Codegen now generates uplc version 1.1.0 scripts when running build with plutus v3.

### Fixed

- **aiken-lang**: formatter should not erase `pub` on validators. @rvcas
- **aiken-lang**: error on using tuple index when a tuple is returned by a generic function. @rvcas
- **aiken-lang**: backpassing with expect gives a warning on pattern matches. @rvcas
- **aiken-lang**: fix a regression in the Type-checker introduced in v1.0.25-alpha regarding types comparison. See #917. @KtorZ
- **aiken-lang**: fix incongruous generics after type-checking which caused [] to be treated as a list in cases where it needed to be an empty map primitive. See #922. @KtorZ
- **aiken-lang**: fix for generic constrs being used as functions causing type mismatch errors. @Microproofs
- **aiken-lang**: fix for error occuring when a field holds Data that is not a constr type when compiler traces are on. @Microproofs
- **aiken-lang**: fix for curry optimization involving 2 constants #945. @MicroProofs
- **aiken-lang**: fix compiler wrongly requiring MillerLoopResult to be 'serialisable' when manipulated as a top-level value. See #921. @KtorZ
- **aiken-lang**: fix type-checker oversight regarding serialisation of generics. See #939. @KtorZ
- **aiken-lang**: fix type-checker not raising error when comparing non-serialisable types. See #940. @KtorZ
- **aiken-project**: show a warning when ignoring modules in lib/validator because they have an invalid name. See #916. @KtorZ

### Changed

> [!WARNING]
>
> **BREAKING-CHANGE**
>
> 2-tuples `(a, b)` are now treated the same as 3+ tuples -- which directly impacts the way that Aiken now deserialise those, especially when nested inside a `List`.
>
> To deserialize into a list of 2-tuple (`List<(a, b)>`), one is now expected to provide a CBOR array of arrays (of 2 elements). Previously, this would require to provide a CBOR map! The downside of the latter is that CBOR serialization libraries do not necessarily preserve the order of keys in a map which could cause issues down the line, in particular with Aiken's dictionnaries.
>
> To recover the old behavior when desired, Aiken introduces a new type `Pair<a, b>` to the language. So any existing program can be migrated by switching any occurences of `(a, b)` to `Pair<a, b>`.
>
> However, it is often preferable to use 2-tuples where possible. The main place you will see usage of `Pair` is in the script context because its form is imposed by the ledger.

- **aiken-lang**: altered internal representation of 2-tuples to distinguish them from pairs. @KtorZ @Microproofs
- **aiken-lang**: some more code gen cleanup. @Microproofs
- **aiken-lang**: new optimization for wrapped builtins found in the stdlib. @Microproofs
- **aiken-project**: slightly restyle warnings to be less noisy. @KtorZ

## v1.0.26-alpha - 2024-03-25

### Fixed

- **aiken-lang**: allow casting of types to Data in function pipiing. @KtorZ

## v1.0.25-alpha - 2024-03-22

### Added

- **aiken-lang**: Data now has a generic argument that can be used to specify the blueprint type. @KtorZ
- **aiken-lang**: New types `PRNG` and `Fuzzer` in the prelude. @KtorZ
- **aiken-lang**: Test definitions now accept an (optional) argument alongside a new keyword `via` to specify fuzzers. @KtorZ
- **aiken-project**: Property-based testing framework with integrated shrinking and case labelling. @KtorZ
- **aiken-project**: Unit tests now show assertion operands as Aiken expression instead of raw UPLC . @KtorZ
- **aiken**: The `check` command now accept an extra arg `--seed` to provide an initial seed for the pseudo-random generator of properties. @KtorZ
- **uplc**: add `integerToByteString` and `byteStringToInteger` builtins. @rvcas @Microproofs
- **aiken-lang**: add `integer_to_byte_string` and `byte_string_to_integer` `aiken/builtins`. @rvcas
- **uplc**: more conformance tests for `integerToByteString` and `byteStringToInteger` along with new ones. @rvcas
- **aikup**: error message when version is not found. @rvcas
- **aiken**: support outputting mainnet addresses for validators. @rvcas
- **aiken-lang**: added serde to CheckedModule to encode modules as cbor. @rvcas
- **aiken-lang**: Strings can contain a nul byte using the escape sequence `\0`. @KtorZ
- **aiken**: The `check` command now accept an extra (optional) option `--max-success` to control the number of property-test iterations to perform. @KtorZ
- **aiken**: The `docs` command now accept an optional flag `--include-dependencies` to include all dependencies in the generated documentation. @KtorZ
- **aiken-lang**: Implement [function backpassing](https://www.roc-lang.org/tutorial#backpassing) as a syntactic sugar. @KtorZ
- **aiken-lang**: Extend backpassing to support multiple patterns/arguments. @rvcas

### Fixed

- **aiken-lang**: Boolean operators (`||` and `&&`) were (somewhat) left-associative. This is now fixed and changed to right-associativity. @KtorZ
- **uplc**: `serialise_data` builtin wrongly encoding some larger ints as tagged CBOR bigints, instead of plain integers over 9 bytes. @KtorZ
- **aiken-project**: Unit tests reports are now inline with the test with less noise. @KtorZ
- **aiken-lang**: Data deserialization for primitive types (pairs, bools, void) now do full checks on the Data structure. @Microproofs
- **aiken-lang**: The identity reducer optimization was not removing the identity function before. That is fixed now.@Microproofs
- **aiken-lang**: Inner opaque types can now be properly destructured by expect and when patterns. @Microproofs
- **aiken-lang**: A codegen specific name-unique interner is now used to preserve lambda scoping. @Microproofs
- **aiken-lang**: if there is only one clause we want to present a warning that suggests that a `let` binding should be used instead but only if it's an exhaustive pattern. @rvcas
- **aiken-lang**: support nested void matching @rvcas
- **uplc**: fix constr identity (`constr-3.uplc`) conformance test. @rvcas
- **aiken-lang**: disallow `MLResult` in a type definition. @rvcas
- **aiken-lang**: reversed deserialization of bls types out of data types. @rvcas
- **aiken-lang**: validator args unexpectedly unbound causing code gen crashes. @rvcas
- **aiken-lang**: allow implicitly discarded values when right-hand side unified with `Void`. @KtorZ
- **aiken-lang**: allow zero arg mutually recursive functions. @Microproofs
- **aiken-lang**: function aliases now resolved to the module and function name in codegen. @Microproofs
- **aiken-lang**: fix indentation of pipelines to remain a multiple of the base indent increment. @KtorZ
- **aiken-lang**: forbid presence of non-serialisable data-types in compound structures like List and Tuple. @KtorZ
- **aiken-lang**: fix 'given' arity reported by 'incorrect arity' error message. @rvcas

### Changed

- **aiken-lang**: Discards will now also type check the validator arguments instead of completely ignoring them. @Microproofs
- **aiken-lang**: Further improvements to tracing when using expect casting from Data. @Microproofs
- **aiken-lang**: The set of curriable builtins with arguments that occur 3 or more times are now hoisted in scope with the arguments curried. @Microproofs
- **aiken-lang**: Improved the way the lambda inliner works to prevent unnecessary inlining into functions. @Microproofs
- **aiken-lang**: Simplifications to the AirTree type in codegen. @Microproofs
- **aiken-lang**: CONSTR_FIELD_EXPOSER and CONSTR_INDEX_EXPOSER now inline the builtins instead. @Microproofs
- **aiken-lang**: SubtractInteger with a constant as the second arg is now flipped to addInteger with a negated constant. @Microproofs
- **aiken-lang**: Validator arguments are now checked per arg instead of after all args are applied. @Microproofs
- **aiken-project**: remove test definitions from dependency modules. @rvcas
- **aiken-project**: ignore warnings from dependency modules. @rvcas
- **aiken-project**: parse sources in parallel, this resulted in a nice speedup. @rvcas
- **aiken-lang**: You can no longer use expect on opaque types in various situations. @rvcas & @KtorZ

## v1.0.24-alpha - 2024-01-31

### Added

- **aiken**: New aliases for `check` (aiken c) and `build` (aiken b) commands. @Kuly14

### Fixed

- **aiken-lang**: Fixed an issue with expects on lists that used discards. This fixes
  the validator issues being seen for previously succeeding validators on 1.0.21-alpha. @MicroProofs
- **aiken-lang**: Out of Span issue is now solved. This also fixes incorrectly selected
  traces from the wrong module, which in some cases lead to the out of span issue. @MicroProofs
- **aiken-lang**: Calling head_list on a list of pairs no longer throws a type error. @MicroProofs

## v1.0.23-alpha - 2024-01-24

### Fixed

- **aiken-lang**: Now using correct discard match for constructor field access.
- **aiken-lang**: The list_access_to_uplc now always returns a lambda wrapped
  term even with only discards. This fixes an apply error being seen by a few
  people.

## v1.0.22-alpha - 2024-01-24

### Added

- **aiken**: New `--trace-level` option for the `check` and `build` commands to
  allow chosing the verbosity level of traces amongst three levels: silent,
  compact & verbose. @MicroProofs @KtorZ
- **aiken**: New `--filter-traces` option for the `check` and `build` commands
  to enable restricting traces with more granularity between user-defined
- **aiken-lang**: Most builtin errors are now caught and instead catched trace
  errors are thrown. The exception is BLS primitives.

### Fixed

- **aiken-lang**: Fix flat encoding and decoding of large integer values. @KtorZ
- **aiken-lang**: Traces should not have following expressions formatted into a
  block. @rvcas
- **aiken-lang**: Sequences should not be erased if the sole expression is an
  assignment. @rvcas
- **aiken-lang**: Should not be able to assign an assignment to an assignment.
  @rvcas
- **aiken-lang**: Should not be able to have an assignment in a logical op
  chain. @rvcas
- **aiken**: Ensures that test expected to fail that return `False` are
  considered to pass & improve error reporting when they fail. @KtorZ
- **aiken-lang**: Fix generic edge case involving tuples.
- **aiken**: `aiken new` now uses the current version for the github action.
- **aiken-lang**: Using the head_list builtin on assoc lists now works.

### Removed

- **aiken**: The options `--keep-traces` (on the `build` command) and
  `--no-traces` (on the `check` command) have been removed; superseded by the
  new options. @MicroProofs @KtorZ

> [!TIP]
>
> - If you've been using `aiken check --no-traces`, you can recover the old
>   behavior by doing `aiken check --trace-level silent`.
> - If you've been using `aiken build --keep-traces`, you can recover the old
>   behavior by doing `aiken build --trace-level verbose`.

## v1.0.21-alpha - 2023-12-04

### Added

- **aiken**: `--watch` flag on the `build`, `check` and `docs` commands to
  automatically watch and re-execute the command on file changes.
  @Quantumplation & @KtorZ
- acceptance tests 28-30 @MicroProofs
- **aiken-lang**: expose BLS builtins and types @MicroProofs & @rvcas
- **aiken-lsp**: implement hover info for tuples, lists, and contructor pattern
  elements @rvcas
- **aiken-lsp**: implement hover on when clause patterns @rvcas
- **aiken-lsp**: hover support for the optional multi validator fn @rvcas
- **aiken-lsp**: implement quickfix for "utf8 byte array is valid hex string"
  warning @rvcas
- **uplc**: add all BLS builtins and types @MicroProofs & @rvcas
- **uplc**: add plutus conformance tests from
  [here](https://github.com/input-output-hk/plutus/tree/master/plutus-conformance/test-cases/uplc/evaluation).
  @MicroProofs & @rvcas
- **uplc**: case and constr cost models @MicroProofs

### Changed

- **aiken**: update to pallas v0.20.0 @rvcas
- **aiken-project**: switch blueprint validator tests now uses insta
  @MicroProofs
- **aiken-project**: update to pallas v0.20.0 @rvcas
- **aiken-lang**: use a better algorithm for inlining single occurrences
  @MicroProofs
- **uplc**: update to pallas v0.20.0 @rvcas
- **uplc**: remove `flat-rs` crate and use it through pallas_codec instead

### Fixed

- **aiken-lang**: formatting unable to have newline after expect bool shortcut
  @rvcas
- **aiken-lang**: formatter incorrectly erasing blocks in certain situations
  @rvcas
- **aiken-lang**: use a distinct warning for discarded let assignments to avoid
  confusion @rvcas
- **aiken-lang**: allow spread operator on positional constructor arguments
  @rvcas
- **aiken-lsp**: and/or chains hovering on nested elements not working @rvcas
- **uplc**: delay typemismatch errors in the machine runtime (caught by
  conformance tests) @rvcas

## v1.0.20-alpha - 2023-10-25

### Added

- **aiken-project**: The `plutus.json` blueprint now contains a `compiler.name`
  and `compiler.version` fields.
- **aiken-prokect**: Added compiler and system information to panic error
  report.
- **aiken-lsp**: Added quickfix suggestions for unknown variables, modules and
  constructors.

### Changed

- **aiken-lang**: Added validator specific error when validator returns false
- **aiken-lang**: Running a multi-validator with traces on will let you know
  which validator function is running
- **aiken-lang**: Multi-validator with traces will give a better error when the
  'spend' redeemer is not properly wrapped with a constr
- **aiken-lang**: Code gen traces are referenced instead of being inlined
  leading to smaller validators

### Fixed

- **aiken-lang**: improved error messages for `a |> b(x)`.
- **uplc**: Fixed cost model issue when using div, quot, rem, mod.
- **aiken-lsp**: Improved hovering suggestions and type annotations.

## v1.0.19-alpha - 2023-09-29

### Fixed

- **aiken-lang**: Fixed small typo in `hoist_dependent_functions` lead to
  internal cyclic calls not being recognized.

## v1.0.18-alpha - 2023-09-29

### Added

- **aiken-lang**: Code gen now allows for mutual recursion

### Fixed

- **aiken-lang**: fixed stack overflow with unbound typing being passed into a
  function with inferred types
- **aiken-lang**: expect on tuples greater than 2 checks the length to ensure
  tuple lists are the same length as the type.

### Changed

- **aiken-lang**: (Code Gen): Rename some of the types to use aliases
- **aiken-lang**: (Code Gen): Remove the use of Air::RecordAccess and TupleIndex
  and replace them with functions that directly get the item at the specified
  index. Also improves performance.
- **uplc**: Added more cases to the inline optimization function to allow the
  removal of further unnecessary lambda bindings.

## v1.0.17-alpha - 2023-09-20

### Added

- **aiken**: add ability to force warnings to cause a failing exit code on
  check, build, and docs
- **aiken-lang**: automatically resolve and fetch latest revision of a package
  on build when a branch is specified as version
- **uplc**: Add Case and Constr Terms; This includes their flat serialization
  and evaluation

### Fixed

- **uplc**: trim whitespace when loading files with hex strings to avoid
  confusing errors #720
- **uplc**: uplc `Constant::Data` formatting
- **aiken-lang**: code gen fixes including nested constr when matches and expect
  on None
- **aiken-lang**: empty records properly parse as record sugar
- **aiken-lang**: escape sequences are now properly preserved after formatting
- **aiken-lang**: fixed parser ambiguity when using record constructor in if
  conditions followed by single-line var expressions #735
- **aiken-project**: when a module name has a hyphen we should behave like rust
  and force an underscore

## v1.0.16-alpha - 2023-08-24

### Removed

- **aiken**: `aiken new` no longer accept an `--empty` flag. Projects are
  generated empty by default.

## v1.0.15-alpha - 2023-08-19

### Added

- **aiken**: Parameters for `blueprint apply` can now be built interactively.

### Changed

- **aiken-lang**: Opaque types are now properly handled in code gen (i.e. in
  code gen functions, in datums/redeemers, in from data casts).
- **aiken**: `blueprint apply` now expects only one OPTIONAL argument. When not
  provided, the parameter will be prompted interactively.
- **aiken-lang**: New tests for code gen around opaque types.
- **aiken-lang**: `traverse_with_tree` now has a boolean parameter to determine
  when `with` is called.

### Removed

- **aiken**: `blueprint apply` no longer accept a target directory. The command
  has to be executed within the same directory as the `aiken.toml`.

## v1.0.14-alpha - 2023-08-16

### Added

- **aiken**: `new` command now fetches latest stdlib version
- **aiken-lang**: new `and` and `or` chaining
  ```
  and {
    1 == 1,
    or {
      2 == 2,
      3 != 2,
      True,
    },
  }
  ```

### Changed

- **aiken-lang**: significantly improved pattern matching exhuastiveness
  checking
- **aiken-lang**: Tx Simulate now returns a list of execution budgets for each
  redeemer instead of calculating the total units required to run all the
  scripts.
- **aiken-lang**: Now code gen uses a tree abstraction to build the Aiken
  Intermediary Representation. This now fixes quite a number of minor issues
  while making the code more maintainable. This is a large leap towards a stable
  version and future updates will be on further simplifying and stabilizing the
  tree abstraction.
- **aiken-lang**: Zero argument anonymous functions now are implemted as a
  delayed function body and calling them simply does force
- **aiken-lang**: Matching on int in expect and when cases is now implemented
- **aiken-lang**: Using assign in nested pattern matches is now implemented
- **aiken-lang**: Using List<Data> as a validator params only checks the type is
  a list and does not attempt to check each item
- **aiken-lang**: Recursion optimization to prevent static parameters from being
  passed through every recursion
- **aiken-lang**: aliased import of single type throws compiler error
- **aiken-lsp**: fix diagnostics and formatting on windows vscode
- **aiken**: decode should always print to textual
- **uplc**: pair type formatting

## v1.0.13-alpha - 2023-07-15

### Added

- **aiken-lang**: `expect foo == bar` desugars into `expect True = foo == bar`

### Fixed

- **aiken-lang**: fail, todo, and trace had issues with sequences and
  expressions

## v1.0.12-alpha - 2023-07-14

### Added

- **aiken**: added a `blueprint policy` command to compute the policy ID of a
  minting script
- **uplc**: parsing and pretty printing for PlutusData

### Fixed

- **aiken-lang**: Prevent mutual recursion caused by conflicting function names
  for generic expect type
- **aiken-lang**: UPLC evaluation of large integers literals (> max u64)
- **aiken-lang**: Parsing of error / todo keywords in when cases
- **aiken-lang**: Parsing of negative integer patterns and constants
- **aiken-lang**: automatically infer unused validator args as `Data`
- **aiken-lang**: test crashing when referencing validators
- **aiken**: mem and cpu values were not showing in white terminals, switched to
  cyan

### Changed

- **uplc**: make list type and pair type parsing match the plutus core spec
- **aiken-lang**: rename `error` to `fail`
- **aiken-lang**: new failing test syntax `test name() fail {`

### Removed

## v1.0.11-alpha - 2023-06-23

### Added

- **aiken**: enhance `aiken new`
- **aiken-lang**: Binary operator are now treated like first-class citizen in
  expressions. In particular, they can be used as function arguments directly:

  ```
  compare_with(a, >=, b) == compare_with(a, fn(l, r) { l >= r }, b)
  ```

- **aiken-lang**: Make traces produced by expect dependent on the value of the
  tracing flag.

### Fixed

- **aiken-lang**: Explain discards and expect a bit better in the unused var
  warning
- **aiken-lang**: Fix expect \_ = ... not including the cast from data logic if
  the type is data and right hand has a type annotation
- **aiken-lang**: Fix for the final clause of a when expecting another clause
  afterwards in nested list cases.
- **aiken-lang**: Fix for all elements were being destructured in tuple clauses
  even if not used.
- **aiken-lang**: Fix for tuple clause not consuming the next case causing
  incomplete contracts. Now tuple clause will always consume the next case
  unless it is the final clause
- **aiken-lang**: Fix for builtins using the incorrect data to type conversion
  when used as a function param.

## v1.0.10-alpha - 2023-06-13

### Added

- **aiken**: added panic hook to present a link to make a bug report

### Fixed

- **aiken-lang**: fmt for `module.Constr { field: value }`
- **aiken-lang**: Issue where using var pattern in a when was passing the constr
  index instead of the constr
- **aiken-lang**: Issue where expecting on a list had unexpected behaviors based
  on list length.
- **aiken-lang**: Issue where expecting on a list from data was using the wrong
  expect cast for the list tail.

### Removed

N/A

## v1.0.8-alpha - 2023-06-08

### Added

- **aiken-lang**: numbers can now be written as hexadecimal digits (e.g. `0x42`)
- **aiken-lang**: numbers can now be written using numeric underscores as
  separator (e.g. `1_000_000`)

### Fixed

- **aiken-lang**: fixed operator precedences, in particular the pipe operator
  (`|>`) which is now of the lowest precedence.
- **aiken-project**: need to convert to Program<Name> before dumping to uplc
- **aiken-lang**: fmt crashing when comment at end of file with no newline
- **aiken-lang**: Fixed error when using nested boolean checks in when
  conditions
- **aiken-lang**: Had the wrong conversion for constant maps to plutus data.
  Fixed to check for right conversion
- **aiken-lang**: Zero arg functions were grabbing extra dependencies they
  didn't need to
- **aiken-lang**: Rearrange list clauses and fill in gaps now handles nested
  patterns in a uniform way
- **aiken-lang**: Fixed discards in records that were being sorted incorrectly
  leading to type issues

### Removed

N/A

## v1.0.7-alpha - 2023-06-02

### Added

- **aiken-lang**: Add a way to express that tests can return an error

### Fixed

- **uplc**: Fix pair formatting
- **aiken-lang**: forced new line in formatter for assignments
- **aiken-lang**: Incorrect parsing of generic type annotation prefixed with
  module
- **aiken-lang**: Incorrect handling of comments at end of a file when newline
  not present
- **aiken-lang**: Record update in code gen is now flexible enough to support
  fields being passed in any order.
- **aiken-lang**: Record update now produces better uplc code then creating a
  record by the normal instantiation.
- **aiken-lang**: Issue with Constructors being passed as functions to other
  function arguments was fixed.
- **aiken-lang**: show module name when type mismatch names are the same
- **aiken**: make `uplc flat` and `uplc unflat` subcommands more consistent and
  flexible

## v1.0.6-alpha - 2023-05-17

### Fixed

- **aiken-lang**: Fix for cases where identity function is used as a param to a
  function or assigned to a var.
- **aiken-lang**: Fix for free unique caused by code gen function having a
  missing dependency.

## v1.0.5-alpha - 2023-05-14

### Added

- **aiken-lang**: Add Record Module support for records with 0 fields
- **aiken-lang**: Added some optimization tests
- **aiken-lang**: Added an Aiken to uplc conversion tests on validators
- **aiken-lang**: Added some uplc builder functions for builtin creation
- **aiken-lang**: Added optimization where identity functions called on an arg
  are reduced to just the arg.

### Fixed

- **aiken-lang**: Fix for nested constructors where the type had a single
  constructor. The fields exposed were not being added to the Air.

## v1.0.4-alpha - 2023-05-09

### Added

- **aiken-lang**: ChooseUnit builtin uses a more efficient way of handling the
  first arg (unit) by just assigning to lambda

### Fixed

- **aiken-lang**: Negative numbers now show up as a constant instead of 0 - that
  number
- **aiken-lang**: Expect on constructors without field maps no longer panics
- **aiken-lang**: Expect on constructors with discard as assigned field names
  now no longer throws free unique

### Changed

- **aiken-lang**: Refactor how builtins are processed to uplc in code gen

## v1.0.3-alpha - 2023-04-28

### Added

- **aiken-lang**: added optimization to help prevent unnecessary data wraps or
  unwraps
- **aiken-lang**: optimization to strip unnecessary lambdas
- **aiken-lang**: implement Clone for ParseError and tipo::Error for the
  playground
- **aiken-project**: added end to end tests on conversion from aiken lang to
  uplc

### Fixed

- **aiken**: fixed 'new' instructions to properly show project name and folder
- **aiken-lang**: Add name of var to the unused var warning
- **aiken-lang**: fix expect on an empty list
- **aiken-lang**: pattern match on boolean with simple clause bodies
- **aiken-lang**: fix for inline_direct_reduce to be applied to pattern match
  function instead of argument
- **aiken-lang**: code gen function dependencies won't be hoisted to the top,
  instead hoisted at the location depended on.

## v1.0.2-alpha - 2023-04-17

### Fixed

- **aiken-lang**: needed to assert_no_assignment in when and if blocks
- **uplc**: need to return deserialization error in some cases for the machine
  builtins

## v1.0.1-alpha - 2023-04-16

### Fixed

- **aiken-lang**: incorrect scoping for anonymous functions
- **aiken-lang**: duplicate arguments were allowed in anonymous functions

## v1.0.0-alpha - 2023-04-13

### Added

- **aiken**: new command `blueprint convert`

### Changed

- **aiken-project**: tests filtering with `-m` during check now happens in
  `Project::collect_tests`
- **aiken-project**: fixed generation of blueprints for recursive and mutually
  recursive data-types
- **aiken-project**: perform validation of parameters on `blueprint apply`

- **aiken-lang**: block `Data` and `String` from unifying when casting
- **aiken-lang**: remove ability for a type with many variants with matching
  field labels and types to support field access
- **aiken-lang**: various uplc code gen fixes
- **aiken-lang**: update todo warning to include type
- **aiken-lang**: `|>` operator can now be formatted as a single (short) line or
  forced over multiline in a flexible manner
- **aiken-lang**: the compiler now provides better feedback for type holes (i.e.
  `_`) in type annotations
- **aiken-lang**: assignment and clause guard are now always formatted on a new
  line
- **aiken-lang**: unused let-bindings are now fully removed from generated code
  and discarded unused let-binding now raise a warning
- **aiken-lang**: support multi-clause patterns (only as a syntactic sugar)
- **aiken-lang**: fix lexer panic when parsing too large (> u32) tuple-indexes

- **uplc**: Greatly improved the Plutus virtual machine performances for script
  evaluation

## v0.0.29 - 2023-02-23

### Added

- **aiken-project**: new dep rayon for parallel test execution
- **aiken**: new blueprint command
- **aiken-lang**: new syntax for defining validators
- **aiken**: new address command for deriving addresses out of `plutus.json`
- **aiken-lang**: Add missing Plutus builtins to Aiken's lang.
- **aiken**: fancy nix stuff
- **aiken-lsp**: go to definition
- **aiken-lsp**: docs on hover
- **aiken-lsp**: enable compiler a project

### Changed

- **aiken-lang**: `assert` renamed to `expect`
- **aiken-lang**: new syntax for strings and byte array literals
- **aiken-lang**: lots of code gen improvements
- **aiken-lang**: validator checks now happen during infer instead of in project
- **aiken-lang**: fixed unicode parsing
- **aiken-lang**: update default costs models
- **aiken-lang**: Use variable-length threshold for levenshtein distance
- **aiken-project**: Move module name validation outside of type-checking
- **aiken-project**: Add 'plutusVersion' to blueprints

### Removed

- **aiken-project**: remove assets folder in favor of `plutus.json`
- **aiken-lang**: removed some unused constant related data types

## v0.0.28 - 2023-01-06

### Added

N/A

### Changed

- **uplc**: Reward accounts are now correctly turned into script credentials in
  ScriptContext.
- **all**: bump pallas version to `v0.16.0`

### Removed

N/A

## v0.0.27 - 2022-MM-DD

### Added

- **aiken-lang**: integrated unit tests

  Aiken now supports writing unit tests directly in source files using the new
  `test` keyword. Tests are functions with no arguments that are implicitly
  typed to `bool`. For example:

  ```gleam
  test foo () {
    1 + 1 == 2
  }
  ```

- **aiken**: new `--skip-tests` flag for the `check` command

### Changed

- **aiken**: `check` now also runs and reports on any `test` found in the
  project
- **aiken**: fix Plutus V1 `to_plutus_data()` for post-alonzo txout with no
  datum hash

### Removed

N/A

## v0.0.26 - 2022-11-23

### Added

- **aiken-lsp**: handle `DidSaveTextDocument` notification
- **aiken-lsp**: convert errors into `lsp_types::Diagnostic`
- **aiken-lang**: doc comment parsing
- **aiken-lang**: code generation for pattern matching expressions
- **aiken-lang**: extended script context
- **aiken-lang**: added Option to builtins
- **aiken-lang**: properly handle record parsing and sugar in patterns

## v0.0.25 - 2022-11-14

### Added

- **aiken**: new `lsp` command
- **aiken**: new `fmt` command
- **aiken**: `build` command now works and outputs assets
- **aiken**: validate project name on `aiken new`
- **aiken-lang**: formatter for `UntypedExpr`
- **aiken-lang**: uplc code gen
- **aiken-lang**: add `Data` to prelude
- **aiken-lang**: allow `Data` to unify with anything that's not in the prelude
- **aiken-project**: validate if validator function return bool
- **aiken-project**: validate if validator function has minimum number of
  arguments
- **aiken-lsp**: new crate that contains the aiken language server

### Changed

- **uplc**: `Converter::get_index` now takes the full name to provide better
  error messages for `Error::FreeUnique`

## v0.0.24 - 2022-11-04

### Changed

- **uplc**: Sorted remaining structured in the ScriptContext (Value, Wdrl, (Ref)
  Inputs, Mint, Required signers, Data, Redeemers)

## v0.0.23 - 2022-11-03

### Changed

- **uplc**: sort inputs for script context fixes an issue in lucid
  https://github.com/spacebudz/lucid/issues/109

## v0.0.22 - 2022-10-31

### Added

- **aiken**: Fancy errors using [miette](https://github.com/zkat/miette)
- **aiken**: Typechecking
- **aiken**: Inject `aiken/builtin` module with some functions from
  `DefaultFunction` in UPLC directly exposed
- **aiken-lang**: add `infer` method to `UntypedModule` which returns a
  `TypedModule`
- **uplc**: Expose various Pallas primitives from UPLC to make constructing UPLC
  types possible for consumers

### Changed

- **aiken**: Project structure is now a bit different. See
  [examples/sample](https://github.com/aiken-lang/aiken/tree/main/examples/sample)
  for more

## v0.0.21 - 2022-10-23

### Added

- **flat-rs**: New errors for debugging flat decoding issues

### Changed

- **uplc**: Fixed overflow issue by changing `i64` to `i128` in `BigInt::Int`
  instances
- **uplc**: Added `apply_params_to_script` function (applies params to script
  and serializes the new script).

## v0.0.20 - 2022-10-17

### Added

- **aiken**: `Project` module which is responsible loading modules and running
  the compilation steps
- **aiken**: `UplcCommand::Flat` flip the cbor_hex if condition so that the
  correct logic runs when using the flag
- **uplc**: use i128 for `Constant::Integer`
- **flat-rs**: add support for i128 encode and decode
- **flat-rs**: add i128 zigzag function