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-rw-r--r--third_party/nix/src/libstore/store-api.hh6
1 files changed, 6 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/store-api.hh b/third_party/nix/src/libstore/store-api.hh
index b1c0b50de376..39769dfb3cd0 100644
--- a/third_party/nix/src/libstore/store-api.hh
+++ b/third_party/nix/src/libstore/store-api.hh
@@ -19,6 +19,12 @@
 
 namespace nix {
 
+// Create a no-op stream buffer used to discard build output in cases
+// where we don't have a build log sink to thread through.
+//
+// TODO(tazjin): Get rid of this and do *something* with those logs.
+std::ostream DiscardLogsSink();
+
 MakeError(SubstError, Error);
 MakeError(BuildError, Error); /* denotes a permanent build failure */
 MakeError(InvalidPath, Error);