diff --git a/src/combinators.jl b/src/combinators.jl
index b313f55ada..42772c4519 100644
--- a/src/combinators.jl
+++ b/src/combinators.jl
@@ -35,6 +35,9 @@ next(rf::AbstractMultiCastingRF, accs, x) = error(
     return results
 end
 
+@inline completebasecase(rf::AbstractMultiCastingRF, accs) =
+    map((f, a) -> completebasecase(f, a), rf.fs, accs)
+
 @inline combine(rf::AbstractMultiCastingRF, lefts, rights) =
     map((f, l, r) -> combine(f, l, r), rf.fs, lefts, rights)
 
diff --git a/test/test_adhocrf.jl b/test/test_adhocrf.jl
index da0e9d559f..dc2f674526 100644
--- a/test/test_adhocrf.jl
+++ b/test/test_adhocrf.jl
@@ -57,7 +57,12 @@ end
     @test foldl_basecase(rf, start(rf, Init)::MVector, 1:10)::SVector == ones(10)
     @test foldxl(rf, 1:10)::MVector == ones(10)
     @test foldxt(rf, 1:10)::SVector == ones(10)
+    @test foldxt(rf, 1:10; basesize = 1)::SVector == ones(10)
     # @test foldxd(rf, 1:10)::SVector == ones(10)  # TODO: test this
+
+    @test foldxt(TeeRF(rf, rf), 1:10)::NTuple{2,SVector} == (ones(10), ones(10))
+    @test foldxt(TeeRF(rf, rf), 1:10; basesize = 1)::NTuple{2,SVector} ==
+          (ones(10), ones(10))
 end
 
 getoninit(rf) = rf.oninit