And, of course, I'd forgotten to add the files for quote.

src/c/ops/quote.c

@@ -0,0 +1,26 @@
+/**
+ * ops/quote.c
+ *
+ * Post Scarcity Soctware Environment
+ *
+ * Special form: protect an expression from evaluation.
+ * 
+ * Copyright (c): 25 Apr 2026 Simon Brooke <simon@journeyman.cc>
+ * Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#include "memory/pointer.h"
+#include "memory/pso4.h"
+
+#include "ops/stack_ops.h"
+
+/**
+ * @brief Special form: protect an expression from evaluation.
+ *
+ * (quote expression)
+ *
+ * @return the expression.
+ */
+struct pso_pointer quote(struct pso_pointer frame_pointer){
+	return fetch_arg(pointer_to_pso4(frame_pointer), 0);
+}

src/c/ops/quote.h

@@ -0,0 +1,18 @@
+/**
+ *  ops/quote.c
+ *
+ *  Post Scarcity Software Environment: quote.
+ *
+ *  Special form: protect an expression from evaluation.
+ *
+ *  (c) 2026 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#ifndef __psse_ops_quote_h
+#define __psse_ops_quote_h
+
+#include "memory/pointer.h"
+
+struct pso_pointer quote(struct pso_pointer frame_pointer);
+#endif