wip: working on walker (externs)

Begin working on extern walking (libs metadata collet + opcode gen)

src/compiler/analyzer/utility.c

@@ -1,6 +1,8 @@
 #include <common/fzl_types.h>
 #include <compiler/fzl_analyzer.h>
+#include <compiler/fzl_parser.h>
 #include <compiler/fzl_token.h>
+#include <compiler/internals/analyzer.h>
 #include <compiler/utils/fzl_symtable.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -101,7 +103,21 @@ fzl_type_t an_toktotype(fzl_analyzer_t *analyzer, fzl_token_t *tok,
     if (sym_found)
       *sym_found = found;
 
-    return found ? sym.type : FZL_TYPE_NULL;
+    if (found && sym.node->type == FZL_NODETYPE_CLASS)
+      return FZL_TYPE_OBJECT;
+
+    if (found && sym.node->type != FZL_NODETYPE_CLASS &&
+        sym.node->type != FZL_NODETYPE_TYPEDEF)
+    {
+      snprintf(an_problem, sizeof(an_problem), "cannot use '%s' as type",
+               sym.name);
+      an_push_error(analyzer, sym.node->token, an_problem);
+      return FZL_TYPE_NULL;
+    }
+
+    return (found || (tok->value && strcmp(tok->value, "null") == 0))
+               ? sym.type
+               : FZL_TYPE_NULL;
   }
 
   if (sym_found)