Check operand exists for Patio local

1 files changed, 6 insertions, 1 deletions

diff --git a/src/main/java/org/shedlang/compiler/backends/llvm/LlvmPatioCodeGen.java b/src/main/java/org/shedlang/compiler/backends/llvm/LlvmPatioCodeGen.java
index bbf7bb41..3dd4dcc7 100644
--- a/src/main/java/org/shedlang/compiler/backends/llvm/LlvmPatioCodeGen.java
+++ b/src/main/java/org/shedlang/compiler/backends/llvm/LlvmPatioCodeGen.java
@@ -782,7 +782,12 @@ public class LlvmPatioCodeGen {
         }
 
         public LlvmOperand patioLocalToOperand(PatioLocalRef value) {
-            return this.patioLocalToOperand.get(value);
+            var operand = this.patioLocalToOperand.get(value);
+            if (operand == null) {
+                throw new RuntimeException("no operand for Patio local: " + value.name());
+            } else {
+                return operand;
+            }
         }
 
         public FunctionContext addPatioLocalToType(PatioLocalRef patioLocal, LlvmType llvmType) {