fix: scope issue when using when with a function call subject

crates/aiken-lang/src/uplc.rs

@@ -427,8 +427,13 @@ impl<'a> CodeGenerator<'a> {
                                 scope: scope.clone(),
                                 name: constr_var.clone(),
                             });
+                            let mut subject_scope = scope.clone();
+                            subject_scope.push(self.id_gen.next());
 
-                            self.build_ir(&subject, ir_stack, scope.clone());
+                            self.build_ir(&subject, ir_stack, subject_scope.clone());
+
+                            let mut scope = scope;
+                            scope.push(self.id_gen.next());
 
                             ir_stack.push(Air::When {
                                 scope: scope.clone(),
@@ -436,9 +441,6 @@ impl<'a> CodeGenerator<'a> {
                                 tipo: subject_tipo.clone(),
                             });
 
-                            let mut scope = scope;
-                            scope.push(self.id_gen.next());
-
                             ir_stack.push(Air::Var {
                                 scope,
                                 constructor: ValueConstructor::public(

examples/acceptance_tests/036/plutus.json

@@ -17,6 +17,59 @@
       },
       "compiledCode": "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",
       "hash": "3f46b921ead33594e1da4afa1f1ba31807c0d8deca029f96fe9fe394"
+    },
+    {
+      "title": "spend",
+      "purpose": "mint",
+      "redeemer": {
+        "title": "Unit",
+        "description": "The nullary constructor.",
+        "anyOf": [
+          {
+            "dataType": "constructor",
+            "index": 0,
+            "fields": []
+          }
+        ]
+      },
+      "parameters": [
+        {
+          "title": "OutputReference",
+          "description": "An `OutputReference` is a unique reference to an output on-chain. The `output_index`\n corresponds to the position in the output list of the transaction (identified by its id)\n that produced that output",
+          "anyOf": [
+            {
+              "title": "OutputReference",
+              "dataType": "constructor",
+              "index": 0,
+              "fields": [
+                {
+                  "title": "transaction_id",
+                  "description": "A unique transaction identifier, as the hash of a transaction body. Note that the transaction id\n isn't a direct hash of the `Transaction` as visible on-chain. Rather, they correspond to hash\n digests of transaction body as they are serialized on the network.",
+                  "anyOf": [
+                    {
+                      "title": "TransactionId",
+                      "dataType": "constructor",
+                      "index": 0,
+                      "fields": [
+                        {
+                          "title": "hash",
+                          "dataType": "bytes"
+                        }
+                      ]
+                    }
+                  ]
+                },
+                {
+                  "title": "output_index",
+                  "dataType": "integer"
+                }
+              ]
+            }
+          ]
+        }
+      ],
+      "compiledCode": "58e301000032323232323232323232222533300632323232533300a3370e0029000099251300400214a060166ea8004c8c8cc004dd6198019802198019802002a40009000119baf33004300500148000020c0040048894ccc03c0084cdd2a400497ae013232533300d300300213374a90001980900125eb804ccc01401400400cc04c00cc04400888c8ccc0040052000003222333300c3370e008004024466600800866e0000d200230140010012300a37540022930b180080091129998040010a4c26600a600260140046660060066016004002ae695cdaab9d5573caae7d5d02ba157441",
+      "hash": "5a5aef5525783c007ee817dd5869ee67000ae5fd730815af7d87ec97"
     }
   ]
 }

examples/acceptance_tests/036/validators/spend.ak

@@ -1,6 +1,6 @@
 use aiken/dict
 use aiken/list
-use aiken/transaction.{Output, ScriptContext}
+use aiken/transaction.{Output, OutputReference, ScriptContext}
 use aiken/transaction/value.{PolicyId}
 
 const my_policy_id: PolicyId = #"0000000000"
@@ -16,3 +16,19 @@ pub fn spend(_datum: Data, _redeemer: Data, ctx: ScriptContext) -> Bool {
   ctx.transaction.outputs
   |> list.any(has_policy_id(_, my_policy_id))
 }
+
+fn mint(
+  output_reference: OutputReference,
+  _redeemer: Void,
+  ctx: ScriptContext,
+) -> Bool {
+  when
+    list.find(
+      ctx.transaction.inputs,
+      fn(input) { input.output_reference == output_reference },
+    )
+  is {
+    Some(_) -> True
+    None -> False
+  }
+}