parameters: (self, tsk)
docstring: Called when a task cannot be executed. The flag :py:attr:`waflib.Runner.Parallel.stop` is set,
  		unless the build is executed with::
  
  			$ waf build -k
  
  		:param tsk: task instance
  		:type tsk: :py:attr:`waflib.Task.Task`
docstring_summary: Called when a task cannot be executed. The flag :py:attr:`waflib.Runner.Parallel.stop` is set,
  		unless the build is executed with::
docstring_tokens: Called when a task cannot be executed . The flag : py : attr : waflib . Runner . Parallel . stop is set unless the build is executed with ::
function: def error_handler(self, tsk):
  		"""
  		Called when a task cannot be executed. The flag :py:attr:`waflib.Runner.Parallel.stop` is set,
  		unless the build is executed with::
  
  			$ waf build -k
  
  		:param tsk: task instance
  		:type tsk: :py:attr:`waflib.Task.Task`
  		"""
  		if not self.bld.keep:
  			self.stop = True
  		self.error.append(tsk)
function_tokens: def error_handler ( self , tsk ) : if not self . bld . keep : self . stop = True self . error . append ( tsk )