This patch disallows attributes named 'all' for the same reason that we
don't want outputs named 'all'.
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 686eedf..1445d75 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -302,6 +302,11 @@ static void prim_derivationStrict(EvalState & state, Value
* * args, Value & v)
else if (outputs.find(key) != outputs.end())
throw EvalError(format("attribute name `%1%' is also a
derivation output name") % key);
+ /* Attributes can't be named 'all' to avoid conflict
+ with the method for accessing all outputs of a derivation */
+ else if (key == "all")
+ throw EvalError("invalid attribute name `all'");
+
/* All other attributes are passed to the builder through
the environment. */
else {
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