Setup the minimal rewrite wiring to rewrite 'def' to Def

include/serene/exprs/def.h

@@ -44,7 +44,7 @@ public:
   node value;
 
   Def(reader::LocationRange &loc, llvm::StringRef binding, node &v)
-      : Expression(loc), binding(binding), value(std::move(v)){};
+      : Expression(loc), binding(binding), value(v){};
 
   ExprType getType() const;
   std::string toString() const;

include/serene/exprs/list.h

@@ -46,7 +46,6 @@ public:
 
   List(const reader::LocationRange &loc) : Expression(loc){};
   List(const reader::LocationRange &loc, node &e);
-  // List(const reader::LocationRange &loc, llvm::MutableArrayRef<node> elems);
   List(const reader::LocationRange &loc, ast elems);
 
   ExprType getType() const;

src/serene/exprs/list.cpp

@@ -26,6 +26,7 @@
 #include "serene/exprs/def.h"
 #include "serene/exprs/symbol.h"
 #include "llvm/Support/Casting.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FormatVariadic.h"
 #include <iterator>
 
@@ -37,10 +38,6 @@ List::List(const reader::LocationRange &loc, node &e) : Expression(loc) {
   elements.push_back(e);
 };
 
-// List::List(const reader::LocationRange &loc, llvm::MutableArrayRef<node>
-// elems)
-//   : Expression(loc), elements(elems.begin(), elems.end()) {};
-
 List::List(const reader::LocationRange &loc, ast elems)
     : Expression(loc), elements(elems){};
 
@@ -58,24 +55,34 @@ std::string List::toString() const {
 };
 
 maybe_node List::analyze(reader::SemanticContext &ctx) {
-  // if (!elements.empty()) {
-  //   auto *first = elements[0].get();
+  if (!elements.empty()) {
+    auto *first = elements[0].get();
 
-  //   if (first->getType() == ExprType::Symbol) {
-  //     auto *sym = llvm::dyn_cast<Symbol>(first);
+    if (first->getType() == ExprType::Symbol) {
+      auto *sym = llvm::dyn_cast<Symbol>(first);
 
-  //     if (sym->name == "def") {
-  //       if (auto err = Def::isValid(this)) {
-  //         // Not a valid `def` form
-  //         return Result<node>::Error(std::move(err));
-  //       }
+      if (sym) {
+        if (sym->name == "def") {
+          if (auto err = Def::isValid(this)) {
+            // Not a valid `def` form
+            return Result<node>::Error(std::move(err));
+          }
 
-  //       auto *binding = llvm::dyn_cast<Symbol>(elements[1].get());
-  //       auto def = make<Def>(binding->name, std::move(elements[2]));
-  //       return Result<node>::Success(std::move(def));
-  //     }
-  //   }
-  // }
+          Symbol *binding = llvm::dyn_cast<Symbol>(elements[1].get());
+
+          if (!binding) {
+            llvm_unreachable("Def::isValid should of catch this.");
+          }
+
+          node def = make<Def>(location, binding->name, elements[2]);
+          return Result<node>::Success(def);
+        }
+      }
+
+      // TODO: Return an error saying the binding has to be
+      //       a symbol
+    }
+  }
 
   return Result<node>::Success(nullptr);
 };

src/serene/reader/semantics.cpp

@@ -39,10 +39,9 @@ exprs::maybe_ast Semantics::analyze(exprs::ast &inputAst) {
       auto &node = maybeNode.getValue();
 
       if (node) {
-        llvm::outs() << "HERE\n" << node->toString() << "  n\n";
-        ast.push_back(std::move(node));
+        ast.push_back(node);
       } else {
-        ast.push_back(std::move(element));
+        ast.push_back(element);
       }
     } else {
       Result<exprs::ast>::Error(std::move(maybeNode.getError()));