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authorEelco Dolstra <e.dolstra@tudelft.nl>2006-09-22T14·31+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2006-09-22T14·31+0000
commit8a1ab709a47f0896cb5b47521e31c8c27f88b2b3 (patch)
tree6f22611693ac7b03903bd561cfe83c42a4596ebc /src/libexpr/nixexpr.cc
parent666babbbfa2fc168b8d511a35065d352b4979dae (diff)
* New builtin functions builtins.{hasAttr, getAttr} to check for
  attribute existence and to return an attribute from an attribute
  set, respectively.  Example: `hasAttr "foo" {foo = 1;}'.  They
  differ from the `?' and `.' operators in that the attribute name is
  an arbitrary expression.  (NIX-61)

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