7 files changed, 8 insertions, 32 deletions
diff --git a/mrbgems/mruby-class-ext/src/class.c b/mrbgems/mruby-class-ext/src/class.c
index fdd56bcc3..255e62f6b 100644
--- a/mrbgems/mruby-class-ext/src/class.c
+++ b/mrbgems/mruby-class-ext/src/class.c
@@ -40,11 +40,7 @@ mrb_mod_module_exec(mrb_state *mrb, mrb_value self)
   mrb_int argc;
   mrb_value blk;
 
-  mrb_get_args(mrb, "*&", &argv, &argc, &blk);
-
-  if (mrb_nil_p(blk)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
-  }
+  mrb_get_args(mrb, "*&!", &argv, &argc, &blk);
 
   mrb->c->ci->target_class = mrb_class_ptr(self);
   return mrb_yield_cont(mrb, blk, self, argc, argv);
diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index b702a3811..e47849dda 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -72,14 +72,11 @@ fiber_init(mrb_state *mrb, mrb_value self)
   mrb_value blk;
   size_t slen;
 
-  mrb_get_args(mrb, "&", &blk);
+  mrb_get_args(mrb, "&!", &blk);
 
   if (f->cxt) {
     mrb_raise(mrb, E_RUNTIME_ERROR, "cannot initialize twice");
   }
-  if (mrb_nil_p(blk)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "tried to create Fiber object without a block");
-  }
   p = mrb_proc_ptr(blk);
   if (MRB_PROC_CFUNC_P(p)) {
     mrb_raise(mrb, E_FIBER_ERROR, "tried to create Fiber from C defined method");
diff --git a/mrbgems/mruby-metaprog/src/metaprog.c b/mrbgems/mruby-metaprog/src/metaprog.c
index 97f53051f..b7d5b6eff 100644
--- a/mrbgems/mruby-metaprog/src/metaprog.c
+++ b/mrbgems/mruby-metaprog/src/metaprog.c
@@ -389,10 +389,7 @@ mod_define_singleton_method(mrb_state *mrb, mrb_value self)
   mrb_sym mid;
   mrb_value blk = mrb_nil_value();
 
-  mrb_get_args(mrb, "n&", &mid, &blk);
-  if (mrb_nil_p(blk)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
-  }
+  mrb_get_args(mrb, "n&!", &mid, &blk);
   p = (struct RProc*)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb->proc_class);
   mrb_proc_copy(p, mrb_proc_ptr(blk));
   p->flags |= MRB_PROC_STRICT;
diff --git a/mrbgems/mruby-object-ext/src/object.c b/mrbgems/mruby-object-ext/src/object.c
index 0aedc9a73..8d5604cad 100644
--- a/mrbgems/mruby-object-ext/src/object.c
+++ b/mrbgems/mruby-object-ext/src/object.c
@@ -100,11 +100,7 @@ mrb_obj_instance_exec(mrb_state *mrb, mrb_value self)
   mrb_value blk;
   struct RClass *c;
 
-  mrb_get_args(mrb, "*&", &argv, &argc, &blk);
-
-  if (mrb_nil_p(blk)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
-  }
+  mrb_get_args(mrb, "*&!", &argv, &argc, &blk);
 
   switch (mrb_type(self)) {
   case MRB_TT_SYMBOL:
diff --git a/mrbgems/mruby-objectspace/src/mruby_objectspace.c b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
index b31dee04c..651c04d92 100644
--- a/mrbgems/mruby-objectspace/src/mruby_objectspace.c
+++ b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
@@ -161,11 +161,7 @@ os_each_object(mrb_state *mrb, mrb_value self)
 {
   mrb_value cls = mrb_nil_value();
   struct os_each_object_data d;
-  mrb_get_args(mrb, "&|C", &d.block, &cls);
-
-  if (mrb_nil_p(d.block)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "Expected block in ObjectSpace.each_object.");
-  }
+  mrb_get_args(mrb, "&!|C", &d.block, &cls);
 
   d.target_module = mrb_nil_p(cls) ? NULL : mrb_class_ptr(cls);
   d.count = 0;
diff --git a/mrbgems/mruby-proc-ext/src/proc.c b/mrbgems/mruby-proc-ext/src/proc.c
index c9041ec75..1627ee474 100644
--- a/mrbgems/mruby-proc-ext/src/proc.c
+++ b/mrbgems/mruby-proc-ext/src/proc.c
@@ -72,10 +72,7 @@ mrb_kernel_proc(mrb_state *mrb, mrb_value self)
 {
   mrb_value blk;
 
-  mrb_get_args(mrb, "&", &blk);
-  if (mrb_nil_p(blk)) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "tried to create Proc object without a block");
-  }
+  mrb_get_args(mrb, "&!", &blk);
 
   return blk;
 }
diff --git a/src/proc.c b/src/proc.c
index ca398384f..5283e5a3e 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -184,11 +184,8 @@ mrb_proc_s_new(mrb_state *mrb, mrb_value proc_class)
   mrb_value proc;
   struct RProc *p;
 
-  mrb_get_args(mrb, "&", &blk);
-  if (mrb_nil_p(blk)) {
-    /* Calling Proc.new without a block is not implemented yet */
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "tried to create Proc object without a block");
-  }
+  /* Calling Proc.new without a block is not implemented yet */
+  mrb_get_args(mrb, "&!", &blk);
   p = (struct RProc *)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb_class_ptr(proc_class));
   mrb_proc_copy(p, mrb_proc_ptr(blk));
   proc = mrb_obj_value(p);