[ET Trac] [Einstein Toolkit] #1651: Problems with expansions in parameter files

[Einstein Toolkit]

#1651: Problems with expansions in parameter files
---------------------+------------------------------------------------------
  Reporter:  hinder  |       Owner:  sbrandt            
      Type:  defect  |      Status:  accepted           
  Priority:  major   |   Milestone:                     
 Component:  Cactus  |     Version:  development version
Resolution:          |    Keywords:                     
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Comment (by rhaas):

 For my money, I would actually prefer if parameters need to be defined
 before they are used, ie. I would prefer if
 {{{
 a::c = a::b
 a::b = 12
 }}}
 would throw an error just the same way that
 {{{
 a::b = 12
 a::b = 13
 }}}
 throws an error. If any order is allowed then I always have to read the
 full parfile instead of only the top part (or hopefully just around where
 the reference occurs since the original assignment happened close by).

 In fact
 {{{
 a::c = a::b
 }}}
 should assign to {{{a::c}}} the default value of {{{a::b}}} as far as I am
 concerned. Parameters always have a value in Cactus, even when just newly
 created by the flesh. :-)

 So I guess my preference would be for set-only-once rather than
 declarative and completely order independent.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1651#comment:9>
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