1 files changed, 6 insertions, 0 deletions
diff --git a/runner.py b/runner.py
index 8e4f86d..0d8560e 100644
--- a/runner.py
+++ b/runner.py
@@ -23,6 +23,12 @@ def evaluate(items, pop):
         if not nxt.symbol.name in STD:
             raise Exception(f"no such symbol: {nxt.symbol.name}")
         this_func = STD[nxt.symbol.name]
+
+        # evaluate inner expressions
+        for idx, arg in enumerate(nxt.args):
+            if isinstance(arg, NebExpression):
+                nxt.args[idx] = evaluate([arg], pop)
+
         if nxt.maybe_sig() not in this_func:
             raise Exception(f"'{nxt.symbol.name}' called with unknown signature: '{nxt.maybe_sig()}'")
         ret = this_func[nxt.maybe_sig()].impl(*(nxt.args))