1 files changed, 16 insertions, 0 deletions
diff --git a/tvix/eval/src/compiler.rs b/tvix/eval/src/compiler.rs
index 193b4a0f33..27e917c545 100644
--- a/tvix/eval/src/compiler.rs
+++ b/tvix/eval/src/compiler.rs
@@ -170,6 +170,11 @@ impl Compiler {
                 self.compile_with(node)
             }
 
+            rnix::SyntaxKind::NODE_ASSERT => {
+                let node = rnix::types::Assert::cast(node).unwrap();
+                self.compile_assert(node)
+            }
+
             kind => panic!("visiting unsupported node: {:?}", kind),
         }
     }
@@ -795,6 +800,17 @@ impl Compiler {
         self.compile(node.body().unwrap())
     }
 
+    fn compile_assert(&mut self, node: rnix::types::Assert) -> EvalResult<()> {
+        // Compile the assertion condition to leave its value on the stack.
+        self.compile(node.condition().unwrap())?;
+        self.chunk.push_op(OpCode::OpAssert);
+
+        // The runtime will abort evaluation at this point if the
+        // assertion failed, if not the body simply continues on like
+        // normal.
+        self.compile(node.body().unwrap())
+    }
+
     // Emit the literal string value of an identifier. Required for
     // several operations related to attribute sets, where identifiers
     // are used as string keys.