class Rcov::CallSiteAnalyzer::CallSite

def calling_method(level = 0)

Might return +nil+ if it could not be determined.
Returns +nil+ if the call originated in +toplevel+.
Name of the method where the call originated. 
def calling_method(level = 0)
  stack_frame = backtrace[level]
  stack_frame ? stack_frame[1] : nil
end