Fix isexpansive for ScanEmit

JuliaFolds · Oct 30, 2019 · 2db4dc1 · 2db4dc1
1 parent a84fed6
commit 2db4dc1
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diff --git a/src/library.jl b/src/library.jl
@@ -1116,7 +1116,7 @@ when the sequence `x₁, x₂, x₃, ..., xₙ, ...` is fed to `ScanEmit(f)`.
 
 $_use_initializer
 
-See also: [`ScanEmit`](@ref), [`Iterated`](@ref).
+See also: [`Scan`](@ref), [`Iterated`](@ref).
 
 # Examples
 ```jldoctest
@@ -1137,7 +1137,7 @@ end
 
 ScanEmit(f, init) = ScanEmit(f, init, nothing)
 
-isexpansive(xf::ScanEmit) = xf.onlast === nothing
+isexpansive(xf::ScanEmit) = xf.onlast !== nothing
 
 start(rf::R_{ScanEmit}, result) =
     wrap(rf, _initvalue(rf), start(inner(rf), result))

diff --git a/test/test_processes.jl b/test/test_processes.jl
@@ -162,10 +162,12 @@ end
     @testset for src in [xs0, collect(xs0)]
         dest = zero(src)
         @test map!(Filter(isodd) |> Scan(+), dest, src) == [1, 0, 4, 0, 9]
+        @test map!(ScanEmit(tuple, 0), dest, src) == 0:4
     end
 
     @testset "Expansive transducers are not allowed" begin
         @test_throws Exception map!(Cat(), [0], 1:1)
+        @test_throws Exception map!(ScanEmit(tuple, 0, identity), [0], 1:1)
     end
 end