Add attached derive clauses to data and newtype declarations#4594
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i-am-the-slime wants to merge 1 commit intopurescript:masterfrom
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Add attached derive clauses to data and newtype declarations#4594i-am-the-slime wants to merge 1 commit intopurescript:masterfrom
i-am-the-slime wants to merge 1 commit intopurescript:masterfrom
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Adds Haskell-style derive clauses directly on data/newtype declarations:
data Color = Red | Green | Blue
derive (Eq, Ord)
newtype Name = Name String
derive newtype (Eq, Show)
Multiple classes per clause, multiple clauses per type, and free mixing
with standalone derive instance syntax. Automatically infers the correct
type application for higher-kinded classes like Functor.
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Summary
Adds
derive (Eq, Ord)clauses directly on data/newtype declarations:Multiple classes per clause, free mixing with standalone
derive instance. Automatically infers correct type application for higher-kinded classes (e.g.Functor).This is a reduced version of #4592, scoping out
derive newtypeandderive viato keep the diff small (11 files, 178 lines).How it works
DeriveClass,DeriveClause) and grammar rulesDeriveClauseDeclarationper classTypeClasses.hsdesugars each into aTypeInstanceDeclarationwithDerivedInstancebody (the same nodederive instanceproduces) and hands it to the existing handler