Precompilation broken on julia 1.5 beta1

[SebastianM-C]

julia> using DiffEqBenchmarks
[ Info: Precompiling DiffEqBenchmarks [31c91b34-3c75-11e9-0341-95557aab0344]
ERROR: LoadError: InitError: Evaluation into the closed module `Markdown` breaks incremental compilation because the side effects will not be permanent. This is likely due to some other module mutating `Markdown` with `eval` during precompilation - don't do this.
Stacktrace:
 [1] eval at .\boot.jl:331 [inlined]
 [2] eval at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Markdown\src\Markdown.jl:6 [inlined]
 [3] __init__() at C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl:10
 [4] _include_from_serialized(::String, ::Array{Any,1}) at .\loading.jl:697
 [5] _require_from_serialized(::String) at .\loading.jl:749
 [6] _require(::Base.PkgId) at .\loading.jl:1040
 [7] require(::Base.PkgId) at .\loading.jl:928
 [8] require(::Module, ::Symbol) at .\loading.jl:923
 [9] include(::Function, ::Module, ::String) at .\Base.jl:380
 [10] include(::Module, ::String) at .\Base.jl:368
 [11] top-level scope at none:2
 [12] eval at .\boot.jl:331 [inlined]
 [13] eval(::Expr) at .\client.jl:467
 [14] top-level scope at .\none:3
during initialization of module WeaveMarkdown
in expression starting at C:\Users\sebastian\.julia\dev\DiffEqBenchmarks\src\DiffEqBenchmarks.jl:3
ERROR: Failed to precompile DiffEqBenchmarks [31c91b34-3c75-11e9-0341-95557aab0344] to C:\Users\sebastian\.julia\compiled\v1.5\DiffEqBenchmarks\3YclJ_OeiSs.ji.
Stacktrace:
 [1] error(::String) at .\error.jl:33
 [2] compilecache(::Base.PkgId, ::String) at .\loading.jl:1290
 [3] _require(::Base.PkgId) at .\loading.jl:1030
 [4] require(::Base.PkgId) at .\loading.jl:928
 [5] require(::Module, ::Symbol) at .\loading.jl:923

This is due to Weave evaling in Markdown during __init__. This is tracked here.

[SebastianM-C]

On julia 1.4.2 this is just a warning

julia> using DiffEqBenchmarks
[ Info: Precompiling DiffEqBenchmarks [31c91b34-3c75-11e9-0341-95557aab0344]
WARNING: eval into closed module Markdown:
Expr(:block, #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):11 =#, Expr(:function, Expr(:call, :latex, Expr(:::, :io, :IO), Expr(:::, :tex, Expr(:., :Markdown, :(:LaTeX)))), Expr(:block, #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):12 =#, :math_envs = Expr(:vect, "align", "equation", "eqnarray"), #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):13 =#, :use_dollars = Expr(:call, Symbol("!"), Expr(:call, :any, Expr(:comprehension, Expr(:generator, Expr(:call, :occursin, Expr(:string, "\begin{", :me), Expr(:., :tex, :(:formula))), :me = :math_envs)))), #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):14 =#, Expr(:&&, :use_dollars, Expr(:call, :write, :io, "\[")), #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):15 =#, Expr(:call, :write, :io, Expr(:call, :string, "
", Expr(:., :tex, :(:formula)), "
")), #= Symbol("C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl"):16 =#, Expr(:&&, :use_dollars, Expr(:call, :write, :io, "\]
")))))
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition latex(IO, Markdown.LaTeX) in module Markdown at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Markdown\src\IPython\IPython.jl:28 overwritten at C:\Users\sebastian\.julia\packages\Weave\zT0iu\src\WeaveMarkdown\markdown.jl:12.
  ** incremental compilation may be fatally broken for this module **

[ChrisRackauckas]

This is an upstream issue with Weave. It should be harmless here though. JunoLab/Weave.jl#356