mapslices + argmax -> "fatal error in type inference (type bound)"

[LilithHafner]

nightly

julia> mapslices(argmax, rand(10,10); dims=2)
ERROR: fatal error in type inference (type bound)
Stacktrace:
 [1] mapslices(f::typeof(argmax), A::Matrix{Float64}; dims::Int64)
   @ Base ./abstractarray.jl:2896
 [2] top-level scope
   @ REPL[100]:1

1.8.0-rc1

julia> mapslices(argmax, rand(10,10); dims=2)
10×1 Matrix{Int64}:
  9
  6
  6
  4
  3
  8
  9
 10
  5
  5

[gbaraldi]

I'm bisecting ;).
As I was suspecting it's #40996, @mcabbott @oscardssmith

Edit: This is a duplicate of #43064

[LilithHafner]

Thanks!

[mcabbott]

That's a less obscure example than mine, from #40996:

julia> mapslices(tuple, [1 2; 3 4], dims=1)
1×2 Matrix{Tuple{Vector{Int64}}}:
 ([1, 3],)  ([2, 4],)

julia> mapslices(x -> tuple(x), [1 2; 3 4], dims=1)
ERROR: fatal error in type inference (type bound)

[LilithHafner]

I'm going to move these examples back to your issue so it's all in one place.