Reset assoc_list and sweep_stack in eval_quote

src/lisp/s-expr.pla

@@ -1019,6 +1019,8 @@ export def eval_expr(expr)#1
 end
 
 export def eval_quote(expr)#1
+  assoc_list      = NULL
+  sweep_stack_top = 0
   push_sweep_stack(expr) // Keep expr from being GC'ed
   expr = eval_expr(expr)
   pop_sweep_stack