fix method ambiguity in similar() (#165)

src/ZMQ.jl

@@ -385,7 +385,7 @@ end
 isfreed(m::Message) = haskey(gc_protect, m.handle)
 
 # AbstractArray behaviors:
-similar(a::Message, T, dims::Dims) = Array{T}(dims) # ?
+similar(a::Message, ::Type{T}, dims::Dims) where {T} = Array{T}(dims) # ?
 # TODO: change `Any` to `Ref{Message}` when 0.6 support is dropped.
 length(zmsg::Message) = Int(ccall((:zmq_msg_size, zmq), Csize_t, (Any,), zmsg))
 size(zmsg::Message) = (length(zmsg),)

test/runtests.jl

@@ -48,7 +48,13 @@ s2=Socket(ctx2, REQ)
 ZMQ.bind(s1, "tcp://*:5555")
 ZMQ.connect(s2, "tcp://localhost:5555")
 
-ZMQ.send(s2, Message("test request"))
+msg = Message("test request")
+# Test similar() and copy() fixes in https://github.com/JuliaInterop/ZMQ.jl/pull/165
+# Note that we have to send this message to work around
+# https://github.com/JuliaInterop/ZMQ.jl/issues/166
+@assert similar(msg, UInt8, 12) isa Vector{UInt8}
+@assert copy(msg) == convert(Vector{UInt8}, "test request")
+ZMQ.send(s2, msg)
 @assert (unsafe_string(ZMQ.recv(s1)) == "test request")
 ZMQ.send(s1, Message("test response"))
 @assert (unsafe_string(ZMQ.recv(s2)) == "test response")