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* Evaluate lets directly (i.e. without desugaring to `rec { attrs...;

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<let-body> = e; }.<let-body>).  This prevents the unnecessary
  allocation of an attribute set.
This commit is contained in:
Eelco Dolstra 2010-04-13 13:42:25 +00:00
parent ac1e8f40d4
commit 7d47498b5e
5 changed files with 45 additions and 1 deletions
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10
src/libexpr/nixexpr.cc
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@ -87,6 +87,16 @@ void ExprLambda::show(std::ostream & str)
str << ": " << *body << ")";
}
void ExprLet::show(std::ostream & str)
{
str << "let ";
foreach (list<Symbol>::iterator, i, attrs->inherited)
str << "inherit " << *i << "; ";
foreach (ExprAttrs::Attrs::iterator, i, attrs->attrs)
str << i->first << " = " << *i->second << "; ";
str << "in " << *body;
}
void ExprWith::show(std::ostream & str)
{
str << "with " << *attrs << "; " << *body;