MethodError when setting PresolveType and SolveType through MOI

[mtanneau]

The following used to work but now results in a MethodError:

import Clp
import MathOptInterface
const MOI = MathOptInterface

clp = Clp.Optimizer()

MOI.set(clp, MOI.RawParameter("SolveType", 4))     # errors
MOI.set(clp, MOI.RawParameter("PresolveType", 1))  # also errors

I did not see any other other case where the following

Error message:

ERROR: MethodError: no method matching ClpSolve_setSolveType(::Ptr{Nothing}, ::Int64)
Closest candidates are:
  ClpSolve_setSolveType(::Any, ::Any, ::Any) at /mnt/c/Users/mathi/Git/Clp.jl/src/gen/libclp_api.jl:593
Stacktrace:
 [1] set(::Clp.Optimizer, ::MathOptInterface.RawParameter, ::Int64) at /mnt/c/Users/mathi/Git/Clp.jl/src/MOI_wrapper/MOI_wrapper.jl:101
 [2] top-level scope at REPL[5]:1

There are at least 3 ways of fixing this. PR incoming.

[mtanneau]

A bit more about why the error happens:

The call MOI.set(clp, MOI.RawParameter("SolveType", 4)) ends up calling ClpSolve_setSolveType(model.solver_options, 4).
The error is then raised because the signature of ClpSolve_setSolveType is

ClpSolve_setSolveType(arg1, method, extraInfo)

(same for ClpSolve_setPresolveType)

According to this, passing extraInfo = -1 results in default behavior.