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+# Added disabler object
+
+A disabler object is a new kind of object that has very specific
+semantics. If it is used as part of any other operation such as an
+argument to a function call, logical operations etc, it will cause the
+operation to not be evaluated. Instead the return value of said
+operation will also be the disabler object.
+
+For example if you have an setup like this:
+
+```meson
+dep = dependency('foo')
+lib = shared_library('mylib', 'mylib.c',
+  dependencies : dep)
+exe = executable('mytest', 'mytest.c',
+  link_with : lib)
+test('mytest', exe)
+```
+
+If you replace the dependency with a disabler object like this:
+
+```meson
+dep = disabler()
+lib = shared_library('mylib', 'mylib.c',
+  dependencies : dep)
+exe = executable('mytest', 'mytest.c',
+  link_with : lib)
+test('mytest', exe)
+```
+
+Then the shared library, executable and unit test are not
+created. This is a handy mechanism to cut down on the number of `if`
+statements.