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bin/gems/facets-3.1.0/demo/core/binding/caller.md

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+The caller.rb script includes a few related methods.
+We will use the following code to demonstrate their use.
+
+    require 'facets/binding/caller'
+
+    a = 1
+    b = 2
+    x = "hello"
+  
+    @bind = binding
+    @line = __LINE__  # the line number must be updated if it moves
+    @file = __FILE__  # why does it equal basename only?
+
+## Binding#caller
+
+    @bind.caller
+
+## Binding#callstack
+
+    @bind.callstack.assert.is_a?(Array)
+
+## Binding#__LINE__
+
+    @bind.__LINE__.assert == @line - 1
+ 
+## Binding#__FILE__
+
+    @bind.__FILE__.assert == @file
+
+## Binding#__DIR__
+
+    @bind.__DIR__.assert == File.dirname(@file)
+
+## Binding#__callee__
+
+This only works for certain versions.
+
+    def alternate_callee
+      binding
+    end
+
+    unless RUBY_VERSION < "1.9"
+      alternate_callee.__callee__.assert == :alternate_callee
+    end
+
+## Binding#__method__
+
+This only works for certain versions.
+
+    def alternate_method
+      binding
+    end
+
+    unless RUBY_VERSION < "1.8.7"
+      alternate_method.__method__.assert == :alternate_method
+    end
+

bin/gems/facets-3.1.0/demo/core/binding/defined.md

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+## Binding#defined?
+
+    require 'facets/binding/defined'
+
+    a = 1
+    b = 2
+    x = "hello"
+
+    binding.assert.defined?("x")
+

bin/gems/facets-3.1.0/demo/core/binding/opvars.md

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+## Binding#[]
+
+    require 'facets/binding/op'
+
+    a = 1
+    b = 2
+    x = "hello"
+
+    binding["x"].assert == "hello"
+
+## Binding#[]=
+
+    binding["x"] = "goodbye"
+
+    binding["x"].assert == "goodbye"
+

bin/gems/facets-3.1.0/demo/core/binding/self.md

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+## Binding#self
+
+    require 'facets/binding/self'
+
+    binding.self == self
+