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authorEelco Dolstra <e.dolstra@tudelft.nl>2010-04-13T13·42+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2010-04-13T13·42+0000
commit7d47498b5ea1ad4685bad954e5407f628f7f5595 (patch)
tree0451c3cd9301030af94a805f476d8b5926edd4d6 /src/libexpr/nixexpr.hh
parentac1e8f40d4a5c380d68bb6f1c7cef6f1e7987c1a (diff)
* Evaluate lets directly (i.e. without desugaring to `rec { attrs...;
  <let-body> = e; }.<let-body>).  This prevents the unnecessary
  allocation of an attribute set.

Diffstat (limited to 'src/libexpr/nixexpr.hh')
-rw-r--r--src/libexpr/nixexpr.hh8
1 files changed, 8 insertions, 0 deletions
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;