Use `uint16_t` for `argc` and `acc` of `mrb_callinfo`

This is because it is enough to express the range up to (-1..255) or (-3..255).

1 files changed, 2 insertions, 2 deletions

diff --git a/include/mruby.h b/include/mruby.h
index ccb76ebe4..79eb5e26f 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -155,8 +155,8 @@ typedef struct {
   struct REnv *env;
   const mrb_code *pc;           /* return address */
   const mrb_code *err;          /* error position */
-  mrb_int argc;
-  mrb_int acc;
+  int16_t argc;
+  int16_t acc;
   struct RClass *target_class;
 } mrb_callinfo;