Raised when an attempt is made to modify an immutable object (such as an `IVar`) after its final state has been set.
# File lib/concurrent/errors.rb, line 36 def initialize(message = nil, inspection_data = nil) @inspection_data = inspection_data super message end
# File lib/concurrent/errors.rb, line 41 def inspect format '%s %s>', super[0..-2], @inspection_data.inspect end