class IRB::Irb

def suspend_name(path = nil, name = nil)

information.
Used by the irb command +source+, see IRB@IRB+Sessions for more

and +name+ as the Context#irb_name.
Evaluates the given block using the given +path+ as the Context#irb_path 
def suspend_name(path = nil, name = nil)
  @context.irb_path, back_path = path, @context.irb_path if path
  @context.irb_name, back_name = name, @context.irb_name if name
  begin
    yield back_path, back_name
  ensure
    @context.irb_path = back_path if path
    @context.irb_name = back_name if name
  end
end