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rose-ash/lib/haskell/tests/deriving.sx
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haskell: deriving (Eq, Show) for ADTs (+11 tests, 565/565)
Parser parses optional deriving clause; only appended to AST when non-empty.
hk-bind-decls! data arm generates dictShow_Con / dictEq_Con per constructor.
hk-binop == and /= now deep-force both sides (SX dict equality is by
reference — two thunks wrapping the same value compared as not-equal without
this). Three token-type fixes in the deriving parser (lparen/rparen/comma,
not "special").

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-06 12:25:51 +00:00

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;; deriving.sx — tests for deriving (Eq, Show) on ADTs.
;; ─── Show ────────────────────────────────────────────────────────────────────
(hk-test
"deriving Show: nullary constructor"
(hk-deep-force
(hk-run "data Color = Red | Green | Blue deriving (Show)\nmain = show Red"))
"Red")
(hk-test
"deriving Show: constructor with arg"
(hk-deep-force
(hk-run "data Wrapper = Wrap Int deriving (Show)\nmain = show (Wrap 42)"))
"(Wrap 42)")
(hk-test
"deriving Show: nested constructors"
(hk-deep-force
(hk-run
"data Tree = Leaf | Node Int Tree Tree deriving (Show)\nmain = show (Node 1 Leaf Leaf)"))
"(Node 1 Leaf Leaf)")
(hk-test
"deriving Show: second constructor"
(hk-deep-force
(hk-run
"data Color = Red | Green | Blue deriving (Show)\nmain = show Green"))
"Green")
;; ─── Eq ──────────────────────────────────────────────────────────────────────
(hk-test
"deriving Eq: same constructor"
(hk-deep-force
(hk-run
"data Color = Red | Green | Blue deriving (Eq)\nmain = show (Red == Red)"))
"True")
(hk-test
"deriving Eq: different constructors"
(hk-deep-force
(hk-run
"data Color = Red | Green | Blue deriving (Eq)\nmain = show (Red == Blue)"))
"False")
(hk-test
"deriving Eq: /= same"
(hk-deep-force
(hk-run
"data Color = Red | Green | Blue deriving (Eq)\nmain = show (Red /= Red)"))
"False")
(hk-test
"deriving Eq: /= different"
(hk-deep-force
(hk-run
"data Color = Red | Green | Blue deriving (Eq)\nmain = show (Red /= Blue)"))
"True")
;; ─── combined Eq + Show ───────────────────────────────────────────────────────
(hk-test
"deriving Eq Show: combined in parens"
(hk-deep-force
(hk-run
"data Shape = Circle Int | Square Int deriving (Eq, Show)\nmain = show (Circle 5)"))
"(Circle 5)")
(hk-test
"deriving Eq Show: eq on constructor with arg"
(hk-deep-force
(hk-run
"data Shape = Circle Int | Square Int deriving (Eq, Show)\nmain = show (Circle 3 == Circle 3)"))
"True")
(hk-test
"deriving Eq Show: different constructors with args"
(hk-deep-force
(hk-run
"data Shape = Circle Int | Square Int deriving (Eq, Show)\nmain = show (Circle 3 == Square 3)"))
"False")
{:fails hk-test-fails :pass hk-test-pass :fail hk-test-fail}