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class B
Q = 'Q in B'
T = 'T in B'
W = 'W in B'
end
class D
D = 'U in D'
end
module M
P = 'P in M'
R = 'R in M'
V = 'V in M'
def puts_U
puts U rescue puts $!
puts W rescue puts $!
end
def self.puts_U
puts U rescue puts $!
puts W rescue puts $!
end
end
class C < D
S = 'S in C'
Q = 'Q in C'
P = 'P in C'
class C < B
include M
S = 'S in C::C'
# constants in the current scope chain:
puts C, P, Q, R, S, T
# constants in base class/mixin of the current scope,
# but not in the current scope chain
puts U rescue puts $!
puts V, W
M.puts_U
# it doesn't matter whether the constants are accessed
# from instance/class method or the class body --
# the lookup is driven by the inner most module lexical scope
def ins
puts '-- ins --'
puts U rescue puts $!
puts V, W
puts_U
end
def self.cls
puts '-- cls --'
puts U rescue puts $!
puts V, W
M.puts_U
end
end
end
C::C.new.ins
C::C.cls
module N
Z = 'Z in N'
end
module O
include N,M
puts '-- module --'
puts P, Z
end
class << Object.new
P = 'P in singleton'
class << Object.new
include M
puts '-- singleton --'
puts P
end
end
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