diff --git a/src/exec.c b/src/exec.c
index 33611c0..f1d208c 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -18,33 +18,16 @@ AST* exec_start(AST* ast) {
     Scope* global = scope_init(NULL);
     global->uses = 1;
 
-    // Keep track of built-in function ASTs, as they arent part of the main
-    // tree.
-    // DList* builtins = dlist_init();
-
-    for (int i = 0; i < BUILTIN_FNS_LN; i++) {
-
-        // AST* builtin_ast =
-        // ast_init(AST_TYPE_BIF, ast_bif_data_init(BUILTIN_FNS[i].fn));
-
-        // dlist_append(builtins, builtin_ast);
-
+    for (int i = 0; i < BUILTIN_FNS_LN; i++)
         htab_ins(
             global->here, BUILTIN_FNS[i].name,
             ast_init(AST_TYPE_BIF, ast_bif_data_init(BUILTIN_FNS[i].fn))
         );
-    }
 
     log_dbg("Completed startup sequence.");
 
     AST* res = exec_exp(ast, global);
 
-    // Clean up built-in function ASTs.
-    /*for (int i = 0; i < builtins->ln; i++) ast_destroy(builtins->buf[i]);
-    dlist_destroy(builtins);
-    */
-
-    // scope_destroy_psv(global);
     return res;
 }
 
@@ -66,10 +49,6 @@ AST* exec_exp(AST* ast, Scope* parent) {
 AST* exec_block(AST* ast, Scope* parent) {
     ASTBlockData* block = (ASTBlockData*)ast->data;
 
-    // Blocks create their own scope, shared among their expressions.
-    // ast->scope = scope_init(parent);
-
-    // HERE
     exec_new_scope(ast, parent);
 
     // Loop through all but last ast.
@@ -120,9 +99,6 @@ AST* exec_cf(AST* ast, size_t argc, AST** argv) {
 
 AST* exec_vdef(AST* ast, Scope* parent) {
     // Use parent's scope.
-    // ast->scope = parent;
-
-    // HERE
     exec_inherit_scope(ast, parent);
 
     ASTVDefData* data = (ASTVDefData*)ast->data;
@@ -134,9 +110,6 @@ AST* exec_vdef(AST* ast, Scope* parent) {
 
 AST* exec_vref(AST* ast, Scope* parent) {
     // Use parent's scope.
-    // ast->scope = parent;
-
-    // HERE
     exec_inherit_scope(ast, parent);
     log_dbg("attempting to reference var");
     ASTVrefData* vref = (ASTVrefData*)ast->data;
@@ -159,10 +132,12 @@ AST* exec_vref(AST* ast, Scope* parent) {
 AST* exec_fdef(AST* ast, Scope* parent) {
     ast->scope = scope_init(parent);
     ASTFDefData* fdef = (ASTFDefData*)ast->data;
-    AST* val = fdef->body;
+    log_dbgf("IS THIS SUSPICIOUS??? %i", fdef->body->type);
+    AST* val = ast;
     char* key = fdef->name;
     scope_add(parent, key, val);
-    return val; // Function definitions return function body.
+    // TODO: Create lambda functions.
+    return fdef->body; // Function definitions return function body.
 }
 
 void exec_print(double n) { printf("= %lf\n", n); }
diff --git a/src/gc.c b/src/gc.c
index 6624e9b..72ba818 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -2,6 +2,7 @@
 #include "include/ast.h"
 #include "include/scope.h"
 #include "include/util.h"
+#include <assert.h>
 #include <stdio.h>
 
 #include <stddef.h>
@@ -13,6 +14,8 @@ void gc_destroy(GC* gc) { free(gc); }
 void f() {}
 
 void* gc_alloc(size_t sz, GCType type) {
+    assert(type <= GC_TYPE_MAX);
+
     void* mem = malloc(sz);
     GC* gc = malloc(sizeof(GC));
 
@@ -22,6 +25,12 @@ void* gc_alloc(size_t sz, GCType type) {
     gc->nxt = gclist;
     gclist = gc;
 
+    if (type == GC_TYPE_AST) {
+        log_dbgf("Alloc'd AST for GC: %p", mem);
+    } else if (type == GC_TYPE_SCOPE) {
+        log_dbgf("Alloc'd scope for GC: %p", mem);
+    }
+
     return mem;
 }
 
diff --git a/src/htab.c b/src/htab.c
index 76a8cfc..052ef75 100644
--- a/src/htab.c
+++ b/src/htab.c
@@ -9,6 +9,8 @@
 HTab* htab_init() {
     HTab* htab = malloc(sizeof(HTab));
 
+    log_dbgf("HTAB %p", htab);
+
     return htab;
 }
 
diff --git a/src/lexer.c b/src/lexer.c
index 8ea1be8..5c909d7 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -26,7 +26,7 @@ void argarr_destroy(ArgArr* argarr) {
 void argarr_destroypsv(ArgArr* argarr) { free(argarr); }
 
 void argarr_add(ArgArr* argarr, AST* arg) {
-    if ((argarr->ln + 1) * argarr->sz > argarr->sz) {
+    if ((argarr->ln + 1) * sizeof(AST*) > argarr->sz) {
         argarr->sz *= 2;
         argarr->buf = realloc(argarr->buf, argarr->sz);
         log_dbgf(
diff --git a/src/main.c b/src/main.c
index d4499ff..0cd57dc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -61,8 +61,6 @@ int main(int argc, char** argv) {
 
             AST* eval = exec_start(root);
             ast_print(eval);
-            // ast_destroy(eval);
-            // ast_destroy(root);
             gc_hack_free();
         }