* Allow the output/expression id to be forced to a certain

  value; this potentially dangerous feature enables better 
  sharing for those paths for which the content is known in 
  advance (e.g., because a content hash is given).
* Fast builds: if we can expand all output paths of a derive 
  expression, we don't have to build.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/fstate.hh b/src/fstate.hh
index 681a8d094180..969abe9e0632 100644
--- a/src/fstate.hh
+++ b/src/fstate.hh
@@ -63,7 +63,7 @@ Hash hashTerm(ATerm t);
 ATerm termFromId(const FSId & id);
 
 /* Write an aterm to the Nix store directory, and return its hash. */
-FSId writeTerm(ATerm t, const string & suffix);
+FSId writeTerm(ATerm t, const string & suffix, FSId id = FSId());
 
 /* Parse an fstate-expression. */
 FState parseFState(ATerm t);