Create checks to avoid a StackOverflowError

[ronisbr]

Hi!

I was using a structure inside a workspace for OrdinaryDiffEq and I was getting this error:

ERROR: StackOverflowError:
Stacktrace:
 [1] ismutable(::Type{T} where T) at /Users/ronisbr/.julia/packages/ArrayInterface/YFV07/src/ArrayInterface.jl:19 (repeats 79978 times)

It seems that something is not defined inside ArrayInterface. I can reproduce it with the following MWE:

julia> mutable struct A
       a
       end

julia> t = A(1)

julia> ArrayInterface.ismutable(t)
ERROR: StackOverflowError:
Stacktrace:
 [1] ismutable(::Type{T} where T) at /Users/ronisbr/.julia/packages/ArrayInterface/YFV07/src/ArrayInterface.jl:19 (repeats 79978 times)

Question: can we define a fallback function that prints an error when we do not know if the type is or isn't mutable?

[ronisbr]

Actually it happens even if a Symbol is inside the structure:

julia> a = :asasd
:asasd

julia> ArrayInterface.ismutable(a)
ERROR: StackOverflowError:
Stacktrace:
 [1] ismutable(::Type{T} where T) at /Users/ronisbr/.julia/packages/ArrayInterface/YFV07/src/ArrayInterface.jl:19 (repeats 79980 times)

[ChrisRackauckas]

We should definitely clean this up so it doesn't stackoverflow.