refactor parameter. var data structure is no longer used

include/picrin.h

@@ -217,6 +217,8 @@ static inline void pic_warn(pic_state *pic, const char *msg)
 
 const char *pic_errmsg(pic_state *);
 
+struct pic_proc *pic_make_var(pic_state *, pic_value, struct pic_proc *);
+
 struct pic_port *pic_stdin(pic_state *);
 struct pic_port *pic_stdout(pic_state *);
 struct pic_port *pic_stderr(pic_state *);

include/picrin/value.h

@@ -121,7 +121,6 @@ enum pic_tt {
   PIC_TT_SENV,
   PIC_TT_MACRO,
   PIC_TT_LIB,
-  PIC_TT_VAR,
   PIC_TT_IREP,
   PIC_TT_DATA,
   PIC_TT_DICT,
@@ -266,8 +265,6 @@ pic_type_repr(enum pic_tt tt)
     return "macro";
   case PIC_TT_LIB:
     return "lib";
-  case PIC_TT_VAR:
-    return "var";
   case PIC_TT_IREP:
     return "irep";
   case PIC_TT_DATA:

include/picrin/var.h

@@ -1,30 +0,0 @@
-/**
- * See Copyright Notice in picrin.h
- */
-
-#ifndef PICRIN_VAR_H
-#define PICRIN_VAR_H
-
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
-struct pic_var {
-  PIC_OBJECT_HEADER
-  pic_value stack;
-  struct pic_proc *conv;
-};
-
-#define pic_var_p(o) (pic_type(o) == PIC_TT_VAR)
-#define pic_var_ptr(o) ((struct pic_var *)pic_ptr(o))
-
-struct pic_var *pic_make_var(pic_state *, pic_value, struct pic_proc * /* = NULL */);
-
-pic_value pic_var_ref(pic_state *, struct pic_var *);
-void pic_var_set(pic_state *, struct pic_var *, pic_value);
-
-#if defined(__cplusplus)
-}
-#endif
-
-#endif