purescript/purescript v0.6.0

v0.6.0 - "Holoship"

on GitHub

For more information on PureScript, see the purescript.org website.

Breaking Changes

• The Alternative type class hierarchy was refactored. See here.
• --runtime-type-checks has been removed. The recommended approach is to use purescript-foreign. (@garyb)
• The Unit type is now used in the Prelude and core libraries to represent values containing no data. (@garyb)
• The Prelude is no longer distributed as a separate file, but is embedded in the compiler executables. (@paf31)
• docgen is now called psc-docs.

New Features

• Newtypes are now supported using the newtype keyword. The runtime representation of a newtype is identical to that of the contained type. (@garyb)
• Multiline string literals are now supported via triple-quote syntax, making FFI declarations much neater. (@phadej)
• Kind signatures on types and type constructor arguments are now supported. (@paf31)

Enhancements

• The runFnN and mkFnN families of functions are now inlined by the optimizer, making interop with JavaScript functions of multiple arguments much simpler. (@paf31)
• Tail call optimization has been improved for functions using case expressions. (@paf31)
• Saturated calls to data constructors are now optimized. (@garyb)
• A new Renamer module now renames identifiers which shadow other names in scope, which greatly simplies code generation. (@garyb)
• psci now provides the following new options:
  • :b to browse a module (@ardumont)
  • :s to show current imports or modules (@ardumont)
  • :k to find the kind of a type constructor (@5outh)
• The approach to checking whether a name is initialized in the generated JavaScript was simplified (@paf31)
• The dependency on the PureScript_paths module has been removed, which makes distribution via binaries simpler. (@paf31)
• Nested if blocks now get optimized. (@garyb)
• Generated code for type class dictionaries was simplified. (@garyb, @dylex)
• The code generator now inserts the version of psc into the file as a comment. (@co-dh)
• () is now valid syntax, referring to the empty row. (@paf31)
• The type checker will now display multiple errors for type errors in the same binding group. (@paf31)
• Imports can now specify hidden names using import ... hiding ( ... ) (@andreypopp)

Bug Fixes

• Binding group errors in type class members are now caught at compile time. (@dylex)
• Some errors related to type checking rows with duplicate labels were fixed. (@paf31)
• Some issues with the calculation of binding groups were fixed. (@paf31)
• Error messages for invalid case declarations are now generated. (@natefaubion)
• Some issues related to module exports were fixed. (@garyb)
• psci now checks imports for validity. (@Bogdanp)

Libraries

• The Alternative type class hierarchy was refactored (@joneshf, @garyb)
• The exceptions library no longer supports throwing exceptions of any type.
• The following libraries have been moved to the core PureScript organisation: (@garyb)
  • purescript-transformers
  • purescript-free
  • purescript-const
  • purescript-identity
  • purescript-lazy
  • purescript-distributive
  • purescript-bifunctors
  • purescript-contravariant
  • purescript-profunctors
  • purescript-maps

Documentation

• The PureScript book is now available.
• The PureScript wiki is now the main resource for compiler and library documentation.