Handle functions without outputs in JITLinker

pytensor/link/basic.py

@@ -656,21 +656,37 @@ class JITLinker(PerformLinker):
         thunk_outputs = [storage_map[n] for n in self.fgraph.outputs]
         fgraph_jit = self.jit_compile(converted_fgraph)
 
-        def thunk(
-            fgraph_jit=fgraph_jit,
-            thunk_inputs=thunk_inputs,
-            thunk_outputs=thunk_outputs,
-        ):
-            try:
-                outputs = fgraph_jit(*(x[0] for x in thunk_inputs))
-            except Exception:
-                # TODO: Should we add a fake node that combines all outputs,
-                #  since the error may come from any of them?
-                raise_with_op(self.fgraph, output_nodes[0], thunk)
+        if thunk_outputs:
 
-            # zip strict not specified because we are in a hot loop
-            for o_storage, o_val in zip(thunk_outputs, outputs):
-                o_storage[0] = o_val
+            def thunk(
+                fgraph_jit=fgraph_jit,
+                thunk_inputs=thunk_inputs,
+                thunk_outputs=thunk_outputs,
+            ):
+                try:
+                    outputs = fgraph_jit(*(x[0] for x in thunk_inputs))
+                except Exception:
+                    # TODO: Should we add a fake node that combines all outputs,
+                    #  since the error may come from any of them?
+                    raise_with_op(self.fgraph, output_nodes[0], thunk)
+
+                # zip strict not specified because we are in a hot loop
+                for o_storage, o_val in zip(thunk_outputs, outputs):
+                    o_storage[0] = o_val
+
+        else:
+            # Edge case - functions without outputs
+            def thunk(
+                fgraph_jit=fgraph_jit,
+                thunk_inputs=thunk_inputs,
+                thunk_outputs=thunk_outputs,
+            ):
+                try:
+                    res = fgraph_jit(*(x[0] for x in thunk_inputs))
+                except Exception:
+                    raise_with_op(self.fgraph, output_nodes[0], thunk)
+                assert res is None
+                return thunk_outputs
 
         thunk.inputs = thunk_inputs
         thunk.outputs = thunk_outputs