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  • v0.10.2 Changes

    November 07, 2016

    Major Changes

    Type-directed search (@kRITZCREEK)

    This extends the typed holes error messages to include suggested replacements for a typed hole, by using type subsumption to determine which identifiers in scope are appropriate replacements.

    A blog post will accompany this feature soon.

    ๐Ÿ“ฆ psc-package (@paf31)

    ๐Ÿ“ฆ This is an experimental package manager for PureScript packages. It supports the following commands:

    • ๐Ÿ“ฆ init - create a new project using the package set for the current compiler version
    • โšก๏ธ update - sync the local package collection with the package set
    • ๐Ÿ“ฆ install - install a specific package from the current set and add it to the package config
    • ๐Ÿ— build - run psc on any active packages
    • ๐Ÿ“ฆ sources - list source globs for active package versions
    • dependencies - list transitive dependencies of the current project

    For example:

    $ psc-package init
    $ psc-package install transformers
    $ psc-package build

    ๐Ÿ“ฆ Eventually, psc-package might replace the use of Bower, but that will require support from tools like Pulp. For now, package authors should continue to publish packages using Bower and Pursuit.

    Data.Generic.Rep.Generic Deriving (@paf31)

    ๐Ÿ‘€ This is an alternative generic programming implementation based on GHC.Generics. It should allow deriving of more interesting classes, such as Semigroup. See the purescript-generics-rep package for examples.

    โœจ Enhancements

    • #2323: Sort IDE-generated explicit imports (@bbqbaron)
    • #2374: Add error message for ambiguous type variables in inferred contexts (@bbqbaron)
    • ๐Ÿšš #934 Add paste mode, remove --multi-line option (@paf31)
    • ๐Ÿ‘ Allow symbols in data constructors (@brandonhamilton)
    • ๐Ÿ›  Fix inliner for integer bitwise operators (@brandonhamilton)
    • ๐Ÿ‘‰ Use SSL for pursuit queries (@guido4000)

    ๐Ÿ› Bug Fixes

    • #2370, allow rows in instance contexts (@paf31)
    • #2379, add error message for unknown classes (@paf31)
    • ๐Ÿ‘ Better error messages for bad indentation (@paf31)
    • ๐Ÿ›  Fix inliner for Data.Array.unsafeIndex (@brandonhamilton)
    • ๐Ÿ›  Fix issue with typed holes in inference mode (@paf31)
    • ๐Ÿ›  Fix scope traversal for do-notation bind. (@LiamGoodacre)
    • ๐Ÿ– Handle TypeLevelString when checking orphans (@joneshf)
    • ๐Ÿšš Move unsafeIndex to Data.Array (@brandonhamilton)
    • ๐Ÿ–จ Pretty-print suggested types differently (@paf31)
    • Traversal should pick up bindings in all value declarations. (@LiamGoodacre)
    • Treat type annotations on top-level expressions as if they were type declarations (@paf31)


    • ๐Ÿ”จ Refactor subsumes function (@paf31)
    • ๐Ÿ”จ Refactor to use lens (@kRITZCREEK)
    • Small cleanup to Language.PureScript.Interactive.IO (@phiggins)
    • ๐Ÿ“œ Speeds up parsing by reading files as Text (@kRITZCREEK)
    • โšก๏ธ Update outdated comments about Prim types (@rightfold)
  • v0.10.1 Changes

    October 02, 2016

    ๐Ÿ’ฅ Breaking Changes

    ๐Ÿ›  The new functional dependencies feature fixes type inference in some cases involving multi-parameter type classes. However, due to a bug in the compiler, some of those expressions were previously type checking where they should not have. As a result, it is necessary to add functional dependencies to some classes in order to make previous code type-check in some cases. Known examples are:

    • MonadEff and MonadAff
    • ๐Ÿ’… MonadState, MonadReader, and the rest of the MTL-style classes in transformers

    ๐Ÿ†• New Features

    Data.Newtype Deriving


    It is now possible to derive the Newtype class for any data declaration which is a newtype, using the existing deriving instance syntax:

    newtype Test = Test String
    derive instance newtypeTest :: Newtype Test _

    Note that the second type argument should be specified as a wildcard, and will be inferred.

    โž• Added type level string functions


    ๐Ÿ— The Prim module now defines the TypeString and TypeConcat type constructors, which can be used to build more descriptive error messages which can depend on types, using the Fail constraint:

    instance cannotShowFunctions
        :: Fail ("Function type " <> TypeString (a -> b) <> " cannot be shown.")
        => Show (a -> b) where
      show _ = "unreachable"
    infixl 6 type TypeConcat as <>



    ๐Ÿ‘ The compiler now supports the --dump-corefn option, which causes the functional core to be dumped in output/**/corefn.json. This should be useful for implementing new backends which interpret the functional core.

    ๐Ÿ†• Newtype Deriving


    It is now possible to derive type class instances for newtypes, by reusing the instance for the underlying type:

    newtype X = X String
    derive newtype instance showX :: Show X

    Note that it is possible to derive instances for multi-parameter type classes, but the newtype must only appear as the last type argument.

    ๐Ÿ‘ Allow anonymous accessor chains (_.a.b)


    Anonymous record accessor syntax has been extended to work with chains of one or more accessors:

    getBaz =

    Functional Dependencies (@paf31)

    ๐Ÿ‘ The type class solver now supports functional dependencies. A multi-parameter type class can define dependencies between its type arguments by using the -> operator:

    class Stream el s | s -> el where
      cons :: el -> (Unit -> s) -> s
      uncons :: s -> { head :: el, tail :: s }

    Here, the s and el type arguments are related by a single functional dependency, which ensures that there is at most one instance for any given type s. Alternatively, the type s determines the type el, i.e. there is an implicit function from types s to types el. This information can be used by the solver to infer types where it was previously not possible.

    ๐Ÿ‘€ See the following examples for more information:

    โœจ Enhancements

    • Return qualifier from explicit/hiding imports (@nwolverson)
    • ๐Ÿ‘Œ Verify entry points exist in psc-bundle (@kRITZCREEK)
    • ๐Ÿ‘Œ Improved error messages for record subsumption (@FrigoEU)


    • Resolve types/kinds for operators (@kRITZCREEK)
    • Unify Completion Commands (@kRITZCREEK)
    • ๐Ÿ“œ Parse type annotations from source files (@kRITZCREEK)
    • โšก๏ธ Update pursuit JSON parsing (@nwolverson)
    • โœ‚ Remove a pursuit workaround (@kRITZCREEK)
    • โž• Add a suggestion to the UnusedDctorImport warning (@FrigoEU)
    • Return JSON errors for cycles in module dependencies (@kRITZCREEK)

    ๐Ÿ› Bug Fixes

    • ๐Ÿ›  Fix usage detection for operators (@garyb)
    • ๐Ÿ›  Fix handling of duplicate module imports in JS codegen (@garyb)
    • ๐Ÿ›  Fix a small bug in the type pretty-printer (@paf31)
    • ๐Ÿ›  Fix function application judgment (@paf31)
    • ๐Ÿ›  Fix inlining for $ and # operators (@garyb)
    • ๐Ÿ›  Fix everywhereOnTypesTopDown (@ianbollinger)
    • ๐Ÿ›  Fix unification of string literals (@paf31)


    • ๐Ÿ‘Œ Support aeson-1.0 (@phadej)
    • ๐Ÿ‘Œ Support http-client-0.5 (@phadej)
    • Safer installation from source in (@hdgarrood)


    • ๐Ÿ›  Fix most HLint warnings (@ianbollinger)
    • ๐Ÿ›  Fixing imports (@charleso)
    • Export desugarDecl from Sugar.ObjectWildcards (@rvion)
    • โœ‚ Remove legacy ObjectGetter and update doc (@rvion)
  • v0.9.3 Changes

    August 01, 2016

    โœจ Enhancements

    • ๐Ÿ‘ Better context information for typed hole errors (@paf31)
    • ๐Ÿ‘Œ Improved error messages in the constraint solver. Type class errors now include better contextual information, including smaller source spans. (@paf31)

    ๐Ÿ› Bug Fixes

    • Decode externs with correct encoding (@natefaubion)
    • ๐Ÿ›  Fix bad codegen for empty string fields (@LiamGoodacre, #2244)
    • Instantiate types in array literals before unification (@paf31, #2252)


    • โฌ†๏ธ Upgrade to protolude 0.1.6 (@ilovezfs)
    • โœ… Use latest LTS (@paf31, #2241)
    • โž• Add upper bound to http-client (@paf31, #2237)
    • ๐Ÿš€ Combine the sdist and coverage builds. Avoid .tix files during deployment. (@paf31)
  • v0.9.2 Changes

    July 11, 2016

    โœจ Enhancements

    Goto Definition

    @kRITZCREEK has added the ability to return position information for expressions in psc-ide. This can be used to implement a Goto Definition feature in IDEs which use psc-ide-server as the backend.

    ๐Ÿ’ป Evaluate PSCi expressions in the browser


    ๐Ÿ’ป PSCi now features an alternative backend, which can run commands in the browser via a websocket. To use this mode, simply pass the --port option on the command line:

    $ pulp psci --port 9000

    ๐Ÿ’ป and open your web browser to localhost on that port.

    ๐Ÿ‘€ See for a demonstration.

    psc-ide architecture changes

    @kRITZCREEK has worked on changing the architecture of psc-ide generally, to load data in multiple phases and asynchronously. This enables new features like Goto Definition above.


    • ๐Ÿ‘ Allow pipes version 4.2 (@felixonmars)
    • Elaborate re-exports (@garyb)

    ๐Ÿ› Bug Fixes


    • ๐Ÿ›  Fix unicode encoding of json responses (@kRITZCREEK)
    • ๐Ÿ‘Œ Improved handling of reexports (@kRITZCREEK)


    • โšก๏ธ Update Data.Function constant for prelude 1.0 (@felixSchl)
    • โš  Include position info in ScopeShadowing warning (@garyb)
  • v0.9.1 Changes

    June 01, 2016

    ๐Ÿš€ PureScript 0.9.1 is a major stable release of the compiler. It removes features which were deprecated in the 0.8.x series, and contains several useful enhancements and bug fixes.

    ๐Ÿš€ This release will be accompanied by new releases of the core libraries and a compatible version of Pulp, which have been updated to work with this version.

    โšก๏ธ Due to the relatively large number of breaking changes, library authors are advised that they will probably need to update their libraries to maintain compatibility. Users may prefer to continue using version 0.8.5 until their dependencies have been updated.

    ๐Ÿ’ฅ Breaking Changes

    Name resolving


    โšก๏ธ The way names are resolved has now been updated in a way that may result in some breakages. The short version is: now only names that have been imported into a module can be referenced, and you can only reference things exactly as you imported them.

    Some examples:

    Import statement Exposed members
    import X A, f
    import X as Y Y.A Y.f
    import X (A) A
    import X (A) as Y Y.A
    import X hiding (f) A
    import Y hiding (f) as Y Y.A

    ๐ŸŒฒ Qualified references like Control.Monad.Eff.Console.log will no longer resolve unless there is a corresponding import Control.Monad.Eff.Console as Control.Monad.Eff.Console. Importing a module unqualified does not allow you to reference it with qualification, so import X does not allow references to X.A unless there is also an import X as X.

    Although the new scheme is stricter it should be easier to understand exactly what the effect of any given import statement is. The old resolution rules for qualified names were obscure and unexpected results could arise when locally-qualified module names overlapped with "actual" module names.

    Module re-exports have also been tightened up as a result of these rules. Now if module X is only imported as Y, the re-export must list module Y also. If a module is imported without being re-qualified then the original name is used.

    Partial Constraints

    (@garyb, @paf31)

    โš  The compiler will now generate an error for a missing Partial constraints, where it would previously have issued a warning.

    Module Restrictions

    (@garyb, @paf31)

    • Imports must now appear before other declarations in a module.
    • A source file must now contain exactly one module.

    ๐Ÿ— These restrictions will allow us to improve incremental build times in future, since we will only need to parse a small prefix of each file in order to figure out what needs to be rebuilt. Right now, we need to parse every file fully.

    Foreign Function Interface Changes


    Foreign modules are now found by filename rather than by searching for a custom JavaScript comment. The foreign module is found by changing the extension of the corresponding PureScript module from .purs to .js.

    This change was made to be more consistent with psc-ide, and also to adopt a simple convention which will port well to other backends.

    Operator Aliases


    ๐Ÿ‘ All operators must be defined as aliases from now on. That is, it is no longer valid to define an operator as a name in local scope (e.g. let (#) x y = x y in ...). This change makes it possible to generate better JavaScript code for operators, by desugaring them to the functions they alias.


    • ๐Ÿšš Deprecated class import/export syntax has been removed (@LiamGoodacre). Classes are now imported using the class keyword, and exported similarly:
      import Prelude (class Show, show)
    • โœ‚ Remove support for = in record binders (@paf31).

    Record binders such as

      f { x = 0 } = true

    are no longer supported. Record binders must now use : instead:

      f { x: 0 } = true
    • Prim.Object has been renamed to Prim.Record (#1768, @paf31)

    โœจ Enhancements

    Programmable Type Errors


    Constraints can now contain type-level strings which can be used as custom error messages using the Fail constraint. For example, one can now document the fact that foreign types such as JSDate cannot be made instances of Generic:

    instance dateIsNotGeneric
      :: Fail "JSDate is not Generic. Consider using Int with toEpochMilliseconds instead."
      => Generic JSDate where
        fromSpine   = crashWith "fromSpine: unreachable"
        toSpine     = crashWith "toSpine: unreachable"
        toSignature = crashWith "toSignature: unreachable"

    Attempting to derive a Generic instance for a type containing JSDate will then result in

    A custom type error occurred while solving type class constraints:
        JSDate is not Generic. Consider using Int with toEpochMilliseconds instead.

    Typed Hole Improvements

    (#2070, @paf31)

    Typed hole error messages now include the types of any names in scope, to assist with type-driven development:

    > :t \x -> maybe 0 ?f x
    Error found:
    in module $PSCI
    at  line 1, column 8 - line 1, column 22
      Hole 'f' has the inferred type
        t0 -> Int
      in the following context:
        it :: Maybe t0 -> Int
        x :: Maybe t0
    in value declaration it
    where t0 is an unknown type

    ๐Ÿ‘ Editor Support

    • ๐Ÿ”Œ The results of the last rebuild are now cached by psc-ide, which improves completion support for editor plugins. (@kRITZCREEK)
    • A reset command was added to psc-ide (@kRITZCREEK)
    • โš  The compiler will now suggest replacements to address MissingTypeDeclaration and TypeWildCard warnings (@nwolverson)

    PSCi Improvements


    • ๐ŸŽ The design of PSCi has been changed to improve performance. PSCi now precompiles all dependencies and uses the same incremental rebuilding approach as psc-ide. This means that the :load and :foreign commands have been removed, since dependencies are fixed and pre-compiled when PSCi loads.
    • ๐Ÿ‘ PSCi now supports alternative base libraries such as Neon, by depending on purescript-psci-support for its supporting code.

    Colors in Error Messages

    ๐ŸŽ Types and values will now be highlighted in error messages, when the terminal supports it (MacOS and Linux for now) (@soupi).

    Type Names

    Prime characters are now allowed in type names. (@garyb)

    ๐Ÿ› Bug Fixes

    • ๐Ÿ“œ Parser error messages inside type class and instance declarations were improved (#2128, @bmjames)
    • Editor suggestions for imports now use (..) (@garyb)
    • Source-spans to token end position (@nwolverson)
    • ๐Ÿ–จ Some pretty printing issues related to string literals in records were fixed (@LiamGoodacre)
    • ๐Ÿ›  Some presentation bugs in PSCi's :show import were fixed (@LiamGoodacre)
    • โšก๏ธ Parsec was updated to the latest version to fix an issue with literal parsing (#2115, @hdgarrood)
    • ๐Ÿ›  Fixed a bug related to certain typed binders which would cause the compiler to crash (#2055, @paf31)
    • As-patterns now bind less tightly (@paf31)
    • ๐Ÿ“œ More identifiers can now be parsed in FFI imports (@michaelficarra)
    • ๐Ÿ›  Fixed a performance issue which manifested under certain conditions in psc-ide (#2064, @kika)
    • ๐Ÿ›  Fixed a test which contained an unreliable comparison (#2093, @andyarvanitis)
    • The precedence of type application was corrected (#2092, @paf31)
    • ๐Ÿ“œ An indentation bug in the parser was fixed (@DavidLindbom)
    • License errors from psc-publish were improved (@hdgarrood)


    • โœ… The test suite now exercises various compiler warnings (@garyb)
    • ๐ŸŽ The test suite performance was improved by using incremental rebuilds (@paf31)
    • โœ… The test suite now tests that passing tests contain a main function (@hdgarrood)
    • โœ… The test suite now supports tests which use multiple files (@garyb)
    • โœ… Portability of the core library test suite was improved (@bmjames)
    • ๐ŸŽ Performance of import elaboration was improved (@garyb)
    • ๐Ÿš€ We now use Stack for our CI builds and release builds (#1974, @hdgarrood)
    • We now use NoImplicitPrelude and enable some global extensions (@garyb)
    • Type-safety in the source-level AST was improved (@garyb)
    • โœ… Use HSpec for the compiler tests (@garyb)
    • ๐Ÿ†• New Prelude names in 0.9 (@garyb)
  • v0.9.0 Changes

    May 22, 2016

    ๐Ÿš€ This is pre-release software

    ๐Ÿš€ This release is provided so that library developers can test the new compiler features.

  • v0.8.5 Changes

    April 21, 2016

    ๐Ÿ†• New Features

    • Fast recompilation for single files in psc-ide-server #1712 (@kRITZCREEK, @paf31)

    The pscid project makes use of this to watch files as you work and raise errors and warnings when they occur with near instant feedback.

    • Operator aliases can now be declared for types #416 (@garyb)
      infixr 6 type Natural as ~>
    • Underscore wildcards can now be used in case and if expressions #1558 (@garyb)
      case _ of
        Something -> ...
      -- underscores can optionally be used in any part of an `if` expression
      cond = if _ then _ else _
      picker = if _ then "x" else "y"
    • Typed holes #1283 (@garyb)
      example :: forall a. Maybe a -> Unit
      example ma = ?umm
      Hole 'umm' has the inferred type
      in value declaration example

    You can use any identifier name after the question mark and that will be used to label the hole in the raised error message.

    ๐Ÿ’ฅ Breaking changes

    • ๐Ÿ“œ Type annotations may need parentheses in some situations that they previously did not due to the introduction of type operators. For example, x :: a == y will be now parsed as x :: (a == y) instead of (x :: a) == y.

    โœจ Enhancements

    • ๐Ÿ‘Œ Improved error messages for invalid FFI identifiers #2011 (@hdgarrood)
    • ๐Ÿ“ฆ psc-publish now allows publishing of packages with a valid SPDX license field in bower.json #1985 (@hdgarrood)
    • Haddock markdown fix #2001 (@trofi)
    • psc-ide now creates the output folder on startup if it is missing #2030 (@kRITZCREEK)

    ๐Ÿ› Bug Fixes

    • ๐Ÿ›  Fixed an issue with incorrect suggestions when re-exporting modules #1862 (@garyb)
    • ๐Ÿ›  Fixed an issue with invalid redundant import warnings #1823 (@garyb)
    • ๐Ÿ›  Fixed an issue where DuplicateSelectiveImport would not fire when it should #2004 (@garyb)
    • ๐Ÿ›  Fixed the error that occurs when an invalid newtype is created that belongs to a data binding group #1895 (@garyb)
    • ๐Ÿ›  Fixed a case where re-exports included unintended exports #1872 (@garyb)
    • Operator aliases can now be declared for qualified data constructors #2015 (@LiamGoodacre)
    • A single hiding import will no longer raise an "unspecified imports" error #2017 (@garyb)
    • ๐Ÿ›  Fixed a case where cycles in modules were being detected when they do not occur #2018 (@garyb)
    • ๐Ÿ Various cases where files were not being read as UTF-8 on Windows were fixed #2027, #2031 (@garyb, @kRITZCREEK)
    • ๐Ÿ›  Fixed some issues in pretty printing of records #2043 (@LiamGoodacre)
    • psci now shows qualified imports correctly #2040 (@LiamGoodacre)
    • ๐Ÿ“œ Parser errors are now returned as JSON during IDE rebuild #2042 (@paf31)
  • v0.8.4 Changes

    April 06, 2016

    ๐Ÿš€ This is an interim bug fix release before 0.9.0.

    โœจ Enhancements

    • Check that FFI imports match with implementations (@hdgarrood)

    This is technically a breaking change, since some existing code might fail to compile if it has missing FFI code (purescript-dom is an example), but these libraries should be fixed soon.

    • Import helper commands in psc-ide (@kRITZCREEK)

    ๐Ÿ› Bug Fixes

    • Disallow constraint generalization for recursive functions. (#1978, @paf31)
    • ๐Ÿ›  Fix #1991, instantiate polymorphic types before unification (@paf31)
    • ๐Ÿ‘‰ Use UTF8 when writing to stdout and stderr (@garyb)
    • ๐Ÿ›  Fix for rendered constrained types needing parens. (@LiamGoodacre)
    • everythingWithScope improperly traversing binary ops (@LiamGoodacre)


    • โšก๏ธ Update to use language-javascript 0.6.x (@nwolverson)
  • v0.8.3 Changes

    March 26, 2016

    ๐Ÿ’ฅ Breaking Changes

    • ๐Ÿ‘ We have dropped support for GHC 7.8 and older (@hdgarrood)

    โœจ Enhancements

    • Infer types with class constraints (@paf31)

    For example, this simple code would previously have failed with a confusing NoInstanceFound error:

      add x y = x + y

    The compiler will now infer the most general type, namely forall a. (Semiring a) => a -> a -> a.

    Note that constraints can only be inferred if they only mention type variables; inference of arbitrary types in constraints is not (yet) supported. So, for example, you would still have to write a type signature for a function which had a constraint such as (MonadEff (console :: CONSOLE | eff) m).

    • 0๏ธโƒฃ Default require path to ../ (@nwolverson)

    The previous default behavior was no require path prefix, which was confusing for some workflows. The new default is ../, which is the prefix used in purs-loader. This option will be removed completely in 0.9.

    • ๐Ÿ”ฆ Expose hiding import suggestion in JSON (@nwolverson)
    • Error on missing LICENSE file or missing license field in bower.json (@faineance)

    ๐Ÿ› Bug Fixes

    • ๐Ÿ›  Fix #1916 (@bagl)
    • ๐Ÿ›  Fix detection of single open import (@garyb)
    • ๐Ÿ›  Fix true not being treated as an infallible guard (@garyb)
    • ๐Ÿ›  Fix pretty printer spinning (@garyb)
    • ๐Ÿ›  Fix Windows build script (@garyb)
    • ๐Ÿ›  Fix #1889, improve performance by avoiding whitespace operations on large strings (@paf31)


    • ๐Ÿ›  Fix a crash related to error messages in the case splitting command (@kRITZCREEK)
    • Escape regex characters when using the flex matcher (@kRITZCREEK)
    • โž• Adds --help commands to the psc-ide executables (@kRITZCREEK)
    • Catches EOF exceptions thrown in acceptCommand (@kRITZCREEK)


    • Switched to Trusty distribution for Travis (@garyb)
    • ๐Ÿ”จ @kRITZCREEK and @faineance worked on refactoring the compiler.
    • โšก๏ธ The optparse-applicative dependency was updated to >= 0.12.1 (@stevejb71)
    • The bower-json dependency was bumped (@hdgarrood)
    • ๐Ÿ‘ Better error message for psc-publish tests (@kRITZCREEK)
    • ๐Ÿ‘‰ Use generic Literal in the AST (@garyb)
  • v0.8.2 Changes

    February 29, 2016

    ๐Ÿ’ฅ Breaking Changes


    โœจ Enhancements

    • psc-ide is now distributed with the compiler! (@kRITZCREEK)

    The psc-ide-server and psc-ide-client executables are now maintained and distributed alongside the compiler. This will ensure that the externs file format used by psc-ide-server is kept in sync with changes in the compiler.

    • Source maps (@nwolverson)

    Source maps can be generated using the --source-maps flag. See the example repository for a full demonstration of source maps using Webpack.

    • Operator aliases for data constructors (@garyb)

    Aliases can now be defined for data constructors. For example:

      data List a = Nil | Cons a (List a)
      infixr 6 Cons as :

    Here, the : operator can be used as a function to replace the Cons constructor, and also in binders.

    • Eq and Ord deriving (@paf31)

    Eq and Ord instances can now be derived, using the derive instance syntax:

      derive instance eqList  :: (Eq  a) => Eq  (List a)
      derive instance ordList :: (Ord a) => Ord (List a)
    • ๐Ÿ“„ Types are now inferred in psc-docs and psc-publish (@hdgarrood)

    If type annotations are missing in source files, they will be inferred by psc-docs and psc-publish before documentation generation.

    • ๐ŸŽ‰ Initial version of new syntax for operator sections (#1846, @paf31)

    Operator sections can now be written using underscores. For example:

      decrementAll :: Array Int -> Array Int
      decrementAll = map (_ - 1)

    which is equivalent to:

      decrementAll :: Array Int -> Array Int
      decrementAll = map (\x -> x - 1)

    ๐Ÿ› Bug Fixes

    • ๐Ÿ‘ Allow one open import without warning (@garyb)

    Warnings for open imports were a pain point for some users after the 0.8 release. This change allows a single open import without a warning. This is still safe in the presence of dependency updates, and does not lead to ambiguity for editor plugins searching for declaration sites.


    • โšก๏ธ @phadej has updated the Stack build to use the latest LTS and nightly builds.
    • ๐Ÿ”จ @izgzhen has refactored the PSCi code to be more readable.
    • ๐Ÿ”จ @hdgarrood has refactored the test suite.