From 7d47498b5ea1ad4685bad954e5407f628f7f5595 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Tue, 13 Apr 2010 13:42:25 +0000
Subject: * Evaluate lets directly (i.e. without desugaring to `rec { attrs...;
   <let-body> = e; }.<let-body>).  This prevents the unnecessary   allocation
 of an attribute set.

---
 src/libexpr/nixexpr.hh | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/libexpr/nixexpr.hh')

diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index f0c05d4352ff..ccddb16298a4 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -139,6 +139,14 @@ struct ExprLambda : Expr
     COMMON_METHODS
 };
 
+struct ExprLet : Expr
+{
+    ExprAttrs * attrs;
+    Expr * body;
+    ExprLet(ExprAttrs * attrs, Expr * body) : attrs(attrs), body(body) { };
+    COMMON_METHODS
+};
+
 struct ExprWith : Expr
 {
     Pos pos;
-- 
cgit 1.4.1