rm InplaceableThunk

Author: mcabbott

src/projection.jl

@@ -118,10 +118,6 @@ ProjectTo() = ProjectTo{Any}()  # trivial case, exists so that maybe_call(f, x)
 
 # Thunks
 (project::ProjectTo)(dx::Thunk) = Thunk(project ∘ dx.f)
-function (project::ProjectTo)(dx::AbstractThunk)
-    @error "ProjectTo shouldn't be applied to thunks other than Thunk, such as InplaceableThunk" project dx
-    return project(unthunk(dx))
-end
 
 # Zero
 ProjectTo(::AbstractZero) = ProjectTo{NoTangent}()  # Any x::Zero in forward pass makes this one projector,

test/projection.jl

@@ -211,11 +211,6 @@ using OffsetArrays, BenchmarkTools
         pth = ProjectTo(4+5im)(th)
         @test pth isa Thunk
         @test unthunk(pth) === 6.0 + 0.0im
-
-        ith = InplaceableThunk(th, dx -> dx .+ 7)
-        @info """don't mind this red "@error" logging message, it's a test!"""
-        pith = ProjectTo(8)(ith)
-        @test pith === 6.0
     end
 
     @testset "display" begin