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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

Unreleased

0.3.6-RC1 - 2019-12-28

Changed

  • Upgrade Dotty to 0.21.0-RC1

0.3.5-RC1 - 2019-11-03

Changed

  • Upgrade Dotty to 0.20.0-RC1

Added

  • eec-core prototype for developing a core language

0.3.3-RC1 - 2019-08-13

Changed

  • Upgrade Dotty to 0.17.0-RC1

0.3.2-RC1 - 2019-07-24

Changed

  • Upgrade Dotty to 0.16.0-RC3

0.3.1-RC3 - 2019-05-7

Changed

  • EEC is renamed to Mesa

0.3.0-RC1 - 2019-05-7

Added

  • A Prelude library, containing data definitions for encodings of sums and linear coproducts in EEC+, and operators for recursion and handling of Void#.
  • Pretty printing for types with a canonical representation of universally quantified types, e.g. forall a b c. (a -> b -> c) -> (a, b) -> c, from an infinite ordered stream matching /[a-z] | [a-z][1-9]/.
  • Lambda terms at the top level in the REPL now type as polymorphic.
  • Allow data types to be isomorphic to ().

Changed

  • Update the representation of data types for printing in the REPL, in preparation for a standard API.
  • Update the syntax for the linear arrow to ->., matching LinearTypes for GHC, and allowing all arrows to have the same right associative precedence.
  • General bug fixes in the type checker for unification of polymorphic types.

0.2.3-RC1 - 2019-04-9

Added

  • Allow the use of patterns inside both let term forms, with the same semantics as a singular case clause.

0.2.3-RC1 - 2019-04-9

Added

  • Allow the use of patterns inside both let term forms, with the same semantics as a singular case clause.

Changed

0.2.2-RC1 - 2019-04-5

Changed

  • Changed linear evaluation from a root expression to a simple expression.
  • Changed linear case expressions to differ from regular case expressions only by the arrow.
  • Changed linear lambda expressions to differ from regular lambda expressions only by the arrow.
  • Updated tests and example files to new syntax.

0.2.1-RC1 - 2019-04-4

Added

  • Separation of scopes for data definitions and normal terms, leading to more flexibility in defining terms. Also prevents shadowing of imported data types, such as the bootstrapped types in the _root_ package.

0.2.0-RC1 - 2019-04-4

Added

  • Type checking that ensures all possible cases in a match expression or linear match expression are provided.
  • data definitions have been added that allow the user to define non-recursive sum types that may be used in match expressions and linear match expressions.
  • DataTypes.hs demo file added.

Changed

  • Updated eec/Isomorphisms.hs with new data definitions, replacing Either A B for L |: R, a new data type, and providing an implementation of +:.

Removed

  • Either and +: have been removed from the compiler's bootstrapped types. The user may now define these data types themselves and enjoy the same semantics.

0.1.2-RC1 - 2019-04-1

Added

  • Stricter semantics for type checking of linear lambdas, variables, constants and ! terms in linear contexts.
  • Addition of ? a.k.a "why not", to summon A from Void in linear contexts.

Changed

0.1-RC1 - 2019-03-31

Added

  • Read Eval Print Loop

    • Define EEC+ terms and typecheck them.
    • Print the parsed AST for EEC+ terms and source files.
    • Print the derived types of EEC+ terms and source files.
    • Print the current environment of terms and types.

  • Linear types that enforce the linear usage of effects.

    • Proof of isomorphisms in Proposition 4.1. of Egger, Ejlers and Simpson (2014) can be found in eec/Isomorphisms.hs.

  • Haskell-like syntax

    • Source files use .hs suffix at present to benefit from syntax highlighting.
    • Refer to eec/src/main/antlr4/EEC.g4 for a context free grammar.