With no argument, or if the argument is the same as the receiver, return the receiver. Otherwise, create a new exception object of the same class as the receiver, but with a message equal to string.to_str.

Construct a new Exception object, optionally passing in a message.

Returns any backtrace associated with the exception. The backtrace is an array of strings, each containing either ``filename:lineNo: in `method’’’ or ``filename:lineNo.’‘

   def a
     raise "boom"
   end

   def b
     a()
   end

   begin
     b()
   rescue => detail
     print detail.backtrace.join("\n")
   end

produces:

   prog.rb:2:in `a'
   prog.rb:6:in `b'
   prog.rb:10

With no argument, or if the argument is the same as the receiver, return the receiver. Otherwise, create a new exception object of the same class as the receiver, but with a message equal to string.to_str.

Return this exception‘s class name an message

Returns the result of invoking exception.to_s. Normally this returns the exception‘s message or name. By supplying a to_str method, exceptions are agreeing to be used where Strings are expected.

Sets the backtrace information associated with exc. The argument must be an array of String objects in the format described in Exception#backtrace.

Returns exception‘s message (or the name of the exception if no message is set).

Returns the result of invoking exception.to_s. Normally this returns the exception‘s message or name. By supplying a to_str method, exceptions are agreeing to be used where Strings are expected.