macro hygiene: don't assume StructIO is in scope in io macro

[stevengj]

Should fix #24.

[yuyichao]

This should work?

julia> module A
       function f end
       macro m(T, v)
           :($A.f(::$(esc(T))) = $(esc(v)))
       end
       end
Main.A

julia> A.@m Int 2

julia> A.f(1)
2

[stevengj]

Look like the nightly failure is an unrelated change to the docsystem (#30).

Update pushed after rebase with workaround for JuliaLang/julia#55438

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.53%. Comparing base (1b79251) to head (0ef98bd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   94.53%   94.53%           
=======================================
  Files           1        1           
  Lines         128      128           
=======================================
  Hits          121      121           
  Misses          7        7           

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