Bug fix for lazy value when passing a pdl_context to a function (#546)

Signed-off-by: Mandana Vaziri <[email protected]>

Author: vazirim

examples/hello/hello-function-empty-context.pdl

@@ -0,0 +1,13 @@
+description: Hello world with function definition and call
+text:
+- def: hello
+  function:
+    name: str
+  return: 
+    text:
+    -  Hello ${ name }!
+    - model: ollama_chat/granite3-dense:8b
+- call: ${ hello }
+  args:
+    name: World
+    pdl_context: []

examples/react/react_call.pdl

@@ -1,7 +1,8 @@
 description: Wikipedia example using the react_fun function definition
 text:
-  - include: ./react_fun.pdl
-  - call: ${ react }
+  - import: react_fun
+    def: lib
+  - call: ${ lib.react }
     args:
       question: How many years ago was the discoverer of the Hudson River born? Keep in mind we are in 2025.
       model: replicate/ibm-granite/granite-3.1-8b-instruct

src/pdl/pdl_interpreter.py

@@ -1536,6 +1536,8 @@ def process_call(
             loc=args_loc,
             trace=block.model_copy(),
         )
+    if "pdl_context" in args:
+        args["pdl_context"] = PdlList(args["pdl_context"])
     f_body = closure.returns
     f_scope = (
         (closure.scope or PdlDict({}))