ref: remove backpatch table in walker

include/compiler/fzl_walker.h

@@ -30,9 +30,6 @@ typedef struct
 
   fzl_symtable_t *syms[64];
   size_t sym_top;
-
-  size_t bp_table[64];
-  size_t bp_top;
 } fzl_walker_t;
 
 // Allocate new walker

src/compiler/fzl_walker.c

@@ -13,9 +13,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-// TODO: implement backpatching struct for jumping on if/else blocks
-// TODO: implement conditional binops; conditions
-
 char wlast_err[256];
 
 fzl_walker_t *fzl_mkwalker(fzl_node_t *root)
@@ -55,9 +52,6 @@ fzl_walker_t *fzl_mkwalker(fzl_node_t *root)
     return NULL;
   }
 
-  memset(walker->bp_table, 0, sizeof(walker->bp_table));
-  walker->bp_top = 0;
-
   return walker;
 }
 
@@ -569,12 +563,6 @@ int fzl_walk(fzl_walker_t *walker)
   fzl_walk_res_t result = walk(walker, walker->root);
   push_op(walker, FZL_OPCODE_RM_ENVTABLE);
 
-  if (walker->bp_top > 0)
-  {
-    snprintf(wlast_err, sizeof(wlast_err), "unfinished conditional block");
-    return -1;
-  }
-
   if (result.error && !wlast_err[0])
     snprintf(wlast_err, sizeof(wlast_err), "%s", result.error_msg);