'webio_serve not defined' when Mux loaded

[IanButterworth]

The bug

This happens with both using WebIO, Mux, TableView and the below:

julia> using Mux, WebIO, TableView

help?> WebIO.webio_serve
  No documentation found.

  Binding WebIO.webio_serve does not exist.

julia> WebIO.webio_serve(showtable(rand(10,10)))
ERROR: UndefVarError: webio_serve not defined
Stacktrace:
 [1] getproperty(::Module, ::Symbol) at ./Base.jl:26
 [2] top-level scope at REPL[3]:1
 [3] eval(::Module, ::Any) at ./boot.jl:331
 [4] eval_user_input(::Any, ::REPL.REPLBackend) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:86
 [5] run_backend(::REPL.REPLBackend) at /Users/ian/.julia/packages/Revise/tV8FE/src/Revise.jl:1165
 [6] top-level scope at none:0

Context

(@v1.4) pkg> st WebIO Mux TableView
Status `~/.julia/environments/v1.4/Project.toml`
  [a975b10e] Mux v0.7.0
  [40c74d1a] TableView v0.4.1
  [0f1e0344] WebIO v0.8.14

julia> versioninfo()
Julia Version 1.4.2
Commit 44fa15b150* (2020-05-23 18:35 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin18.7.0)
  CPU: Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-8.0.1 (ORCJIT, skylake)
Environment:
  JULIA_REQUIRES_DISABLED = 1

[IanButterworth]

My mistake, I had broken/disabled Requires and forgotten about it