Precompilation failure

[blegat]

Precompilation of StochasticDiffEq.jl fails both on the latest tagged version and on master

julia> Pkg.update()
...
julia> using StochasticDiffEq
INFO: Precompiling module StochasticDiffEq.
ERROR: LoadError: LoadError: UndefVarError: @compat not defined
 in macro expansion; at ./none:2 [inlined]
 in anonymous at ./<missing>:?
while loading /home/blegat/.julia/v0.5/StochasticDiffEq/src/algorithms.jl, in expression starting on line 5
while loading /home/blegat/.julia/v0.5/StochasticDiffEq/src/StochasticDiffEq.jl, in expression starting on line 21
ERROR: Failed to precompile StochasticDiffEq to /home/blegat/.julia/lib/v0.5/StochasticDiffEq.ji.
 in eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:64
 in macro expansion at ./REPL.jl:95 [inlined]
 in (::Base.REPL.##3#4{Base.REPL.REPLBackend})() at ./event.jl:68

julia> Pkg.checkout("StochasticDiffEq")
INFO: Checking out StochasticDiffEq master...
INFO: Pulling StochasticDiffEq latest master...
INFO: No packages to install, update or remove

julia> using StochasticDiffEq
INFO: Precompiling module StochasticDiffEq.
ERROR: LoadError: LoadError: UndefVarError: @compat not defined
 in macro expansion; at ./none:2 [inlined]
 in anonymous at ./<missing>:?
while loading /home/blegat/.julia/v0.5/StochasticDiffEq/src/algorithms.jl, in expression starting on line 5
while loading /home/blegat/.julia/v0.5/StochasticDiffEq/src/StochasticDiffEq.jl, in expression starting on line 21
ERROR: Failed to precompile StochasticDiffEq to /home/blegat/.julia/lib/v0.5/StochasticDiffEq.ji.
 in eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:64
 in macro expansion at ./REPL.jl:95 [inlined]
 in (::Base.REPL.##3#4{Base.REPL.REPLBackend})() at ./event.jl:68

[tpoisot]

Same here.

[ChrisRackauckas]

This on release? How could release change?

[ChrisRackauckas]

Oh... @mauro3 , I think this is related to the use of compat in Parameters.jl

[ChrisRackauckas]

Pkg.pin("Parameters",v"0.6.0") is a temporary fix. I'll put in a PR to METADATA for an upper bound and that will make release work again. However, this seems to be a deeper packaging issue that may require some discussion with @tkelman for a better solution. I'll post what's going on to Discourse soon and link it here.

[tpoisot]

@ChrisRackauckas good call on all points. On the other hand, nothing is 1.0 yet, so breakage is expected to happen.

[ChrisRackauckas]

This is a more systemic problem about how macros work with the packaging system. It's clear with the example. The change in Parameters requires its dependencies, and not just itself, to require Compat. That's the weird breakage.

[ChrisRackauckas]

Here's a description of the bug: https://discourse.julialang.org/t/nested-macros-bypass-package-dependencies/2683

As noted, easy fix... but I wanted to get it documented first because this is something I want to avoid in the future. I'll do the METADATA PRs right now.

[ChrisRackauckas]

METADATA PR to fix it is here:

JuliaLang/METADATA.jl#8343

[ChrisRackauckas]

Should be fixed now.