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test2.rb

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+require 'pp'
+#require 'pry'
+require 'binding_of_caller'
+
+def cards
+  ace = 'of hearts'
+  queen = 'of diamonds'
+  binding
+end
+
+c = cards
+
+pp c.eval('ace')
+pp c.eval('ace = "of spades"')
+pp c.eval('ace')
+pp c.eval('foo = 42')
+pp c.eval('foo')
+
+def set_baz(b)
+  b.eval('baz = 44')
+  pp b.eval('baz')
+  pp binding.callers
+end
+
+def meh
+  foo = 42
+  bar = 43
+  #baz = nil
+
+  set_baz binding
+  binding
+end
+
+m = meh
+
+pp m.eval('foo')
+pp m.eval('bar')
+pp m.eval('baz')