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* Added syntactic sugar to the construction of attribute sets to

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`inherit' variables from the surrounding lexical scope.

  E.g.,

    {stdenv, libfoo}: derivation {
      builder = ./bla;
      inherit stdenv libfoo;
      xyzzy = 1;
    }

  is equivalent to

    {stdenv, libfoo}: derivation {
      builder = ./bla;
      stdenv = stdenv;
      libfoo = libfoo;
      xyzzy = 1;
    }

  Note that for mutually recursive attribute set definitions (`rec
  {...}'), this also works, that is, `rec {inherit x;}' is equivalent
  to `let {fresh = x; body = rec {x = fresh;};}', *not*
  `rec {x = x}'.
This commit is contained in:
Eelco Dolstra 2004-02-02 21:39:33 +00:00
parent d9f30fe7c7
commit 1c9c0a5a46
6 changed files with 78 additions and 41 deletions
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2
src/libexpr/primops.cc
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@ -96,7 +96,7 @@ static string processBinding(EvalState & state, Expr e, StoreExpr & ne)
return st.str();
}
if (atMatch(m, e) >> "Attrs" >> es) {
if (atMatch(m, e) >> "Attrs") {
Expr a = queryAttr(e, "type");
if (a && evalString(state, a) == "derivation") {
a = queryAttr(e, "drvPath");