A.class_eval(<<-EOF, __FILE__, __LINE__)
def method_a
puts "calling method_a......"
end
EOF
A.class_eval <<-EOF
def method_b
puts "calling method_b......"
end
EOF
A.new.method_a
A.new.method_b
如上，两种方法定义的区别？
测试的时候是由 eval 抛出异常，如果不加 _ FILE _ , 和 _ LINE _ 就不会显示文件和行号信息而是直接显示 from (eval) 被 markdown 加斜了...
class A
end
A.class_eval(<<-EOF, __FILE__, __LINE__)
def method_a
puts "calling method_a......"
end
EOF
A.new.method_a("bug")
class_eval.rb:3:in method_a': wrong number of arguments (1 for 0) (ArgumentError)
from class_eval.rb:15:in
class A
end
A.class_eval <<-EOF
def method_b
puts "calling method_b......"
end
EOF
A.new.method_b("bug")
(eval):1:in method_b': wrong number of arguments (1 for 0) (ArgumentError)
from class_eval.rb:16:in
