From ae59f17cb3d58de7afca7f441d8bcf9a718e024c Mon Sep 17 00:00:00 2001
From: Arnaud Bailly <arnaud@pankzsoft.com>
Date: Wed, 5 Nov 2025 09:15:46 +0100
Subject: handle defitions in untyped language

---
 lambda-calcul/haskell/test/Minilang/Lambda/ParserSpec.hs | 10 +++++-----
 lambda-calcul/haskell/test/Minilang/REPLSpec.hs          | 11 +++++++++++
 2 files changed, 16 insertions(+), 5 deletions(-)

(limited to 'lambda-calcul/haskell/test/Minilang')

diff --git a/lambda-calcul/haskell/test/Minilang/Lambda/ParserSpec.hs b/lambda-calcul/haskell/test/Minilang/Lambda/ParserSpec.hs
index e7816c6..e6f05b9 100644
--- a/lambda-calcul/haskell/test/Minilang/Lambda/ParserSpec.hs
+++ b/lambda-calcul/haskell/test/Minilang/Lambda/ParserSpec.hs
@@ -98,14 +98,14 @@ spec = parallel $ do
                 )
                 `shouldSatisfy` isRight
 
-  it "parses a definition" $ do
-    let defStr = "(def id (lam (x) x))"
-        expectedAST = Def "id" (Abs ["x"] (Sym "x"))
-    parse defStr `shouldBe` Right expectedAST
+  prop "parses a definition" $
+    forAll (genDef 5) $ \ast ->
+      let text = pretty ast
+       in parse text `shouldBe` Right ast
 
 spine :: AST -> Int
 spine = \case
-  App x y rest -> 1 + spine x + length rest
+  App x _ rest -> 1 + spine x + length rest
   _ -> 0
 
 arity :: AST -> Int
diff --git a/lambda-calcul/haskell/test/Minilang/REPLSpec.hs b/lambda-calcul/haskell/test/Minilang/REPLSpec.hs
index cf6ef01..81ac25c 100644
--- a/lambda-calcul/haskell/test/Minilang/REPLSpec.hs
+++ b/lambda-calcul/haskell/test/Minilang/REPLSpec.hs
@@ -23,6 +23,17 @@ spec = parallel $
                      "y : <?>"
                    ]
 
+    it "evaluates untyped MiniLang terms with definitions" $ do
+      let out =
+            withInput
+              ["(def id (lam (x) x))", "(id y)"]
+
+      out
+        `shouldBe` [ "Bye!",
+                     "y : <?>",
+                     "id : <?>"
+                   ]
+
     it "defaults untyped terms" $ do
       let out =
             withInput
-- 
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