ref: add type/classname result for each gen_* function

src/compiler/generator/gen_fmtstr.c

@@ -1,18 +1,21 @@
+#include <common/fzl_types.h>
 #include <compiler/internals/gen.h>
 #include <stdbool.h>
+#include <stdio.h>
 
 // Format string
-bool gen_fmtstr(fzl_gen_t *gen, fzl_node_t *node)
+gen_res_t gen_fmtstr(fzl_gen_t *gen, fzl_node_t *node)
 {
   if (!gen || !node)
-    return false;
+    return (gen_res_t){.error = true};
 
   for (size_t i = 0; i < node->list.entry_count; i++)
-    if (!gen_common(gen, node->list.entries[i]))
-      return false;
+    if (gen_common(gen, node->list.entries[i]).error)
+      return (gen_res_t){.error = true};
 
   gen_op(gen, FZL_OPCODE_BUILD_STR);
   gen_word(gen, node->list.entry_count);
 
-  return true;
+  return (gen_res_t){
+      .error = false, .type = FZL_TYPE_STRING, .classname = NULL};
 }