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assert '"nil"', "p defined? nil"
assert '"self"', "p defined? self"
assert '"true"', "p defined? true"
assert '"false"', "p defined? false"
assert '"expression"', "p defined? 123"
assert '"expression"', "p defined? 'foo'"
assert '"expression"', "p defined? [1,2,3]"
assert '"expression"', "p defined? []"
assert '"assignment"', "p defined? a=1"
assert '"assignment"', "p defined? $a=1"
assert '"assignment"', "p defined? @a=1"
assert '"assignment"', "p defined? A=1"
assert '"assignment"', "p defined? a||=1"
assert '"assignment"', "p defined? a&&=1"
assert '"assignment"', "1.times { |x| p defined? x=1 }"
assert '"local-variable"', "a = 123; p defined? a"
assert '"local-variable"', "1.times { |x| p defined? x }"
assert 'nil', "p defined? @a"
assert '"instance-variable"', "@a = 123; p defined? @a"
assert 'nil', "p defined? $a"
assert '"global-variable"', "$a = 123; p defined? $a"
assert 'nil', "p defined? A"
assert '"constant"', "A = 123; p defined? A"
assert 'nil', "p defined?(yield)"
assert '"expression"', "FOO=42; p (defined? FOO && 42)"
assert '"expression"', "p (defined? FOO && 42)", :known_bug => true