Add a scenario for anonymous block forwarding

I noticed that TestProf does not work with code that uses anonymous
block forwarding, so I added a scenario.

Author: sinsoku

lib/typeprof/core/ast/call.rb

@@ -45,7 +45,8 @@ def initialize(raw_node, recv, mid, mid_code_range, raw_args, last_arg, raw_bloc
 
         if raw_block
           if raw_block.type == :block_argument_node
-            @block_pass = AST.create_node(raw_block.expression, lenv)
+            # TODO: Support anonymous block forwarding
+            @block_pass = AST.create_node(raw_block.expression, lenv) if raw_block.expression
           else
             @block_pass = nil
             @block_tbl = raw_block.locals

scenario/block/anonymous_block_forwarding.rb

@@ -0,0 +1,18 @@
+## update
+def foo(&)
+  bar(&)
+end
+
+def bar(&b)
+  b.call(1.0)
+end
+
+foo do |n|
+  "str"
+end
+
+## assert
+class Object
+  def foo: -> untyped
+  def bar: { (Float) -> untyped } -> untyped
+end