deprecate rand(::Tuple)

NEWS.md

@@ -941,6 +941,9 @@ Deprecated or removed
      have been deprecated. Subtypes of `AbstractArray` that implement the newly introduced strided
      array interface should define their own `strides` method ([#25321]).
 
+  * `rand(t::Tuple{Vararg{Int}})` is deprecated in favor of `rand(Float64, t)` or `rand(t...)`;
+    `rand(::Tuple)` will have another meaning in the future ([#25429], [#25278]).
+
 
 Command-line option changes
 ---------------------------

stdlib/Random/src/Random.jl

@@ -220,10 +220,8 @@ function rand!(rng::AbstractRNG, A::AbstractArray{T}, sp::Sampler) where T
     A
 end
 
-rand(r::AbstractRNG, dims::Dims)       = rand(r, Float64, dims)
-rand(                dims::Dims)       = rand(GLOBAL_RNG, dims)
-rand(r::AbstractRNG, dims::Integer...) = rand(r, Dims(dims))
-rand(                dims::Integer...) = rand(Dims(dims))
+rand(r::AbstractRNG, dims::Integer...) = rand(r, Float64, Dims(dims))
+rand(                dims::Integer...) = rand(Float64, Dims(dims))
 
 rand(r::AbstractRNG, X, dims::Dims)  = rand!(r, Array{eltype(X)}(uninitialized, dims), X)
 rand(                X, dims::Dims)  = rand(GLOBAL_RNG, X, dims)
@@ -273,7 +271,8 @@ Pick a random element or array of random elements from the set of values specifi
   integers (this is not applicable to [`BigInt`](@ref)), and to ``[0, 1)`` for floating
   point numbers;
 
-`S` defaults to [`Float64`](@ref).
+`S` defaults to [`Float64`](@ref)
+(except when `dims` is a tuple of integers, in which case `S` must be specified).
 
 # Examples
 ```julia-repl

stdlib/Random/src/deprecated.jl

@@ -15,3 +15,7 @@ end
 
 @deprecate convert(::Type{UInt128},     u::UUID)     UInt128(u)
 @deprecate convert(::Type{UUID}, s::AbstractString)  UUID(s)
+
+# PR #25429
+@deprecate rand(r::AbstractRNG, dims::Dims) rand(r, Float64, dims)
+@deprecate rand(                dims::Dims) rand(Float64, dims)

stdlib/Random/test/runtests.jl

@@ -355,7 +355,6 @@ for rng in ([], [MersenneTwister(0)], [RandomDevice()])
         f(rng..., 5)                  ::Vector{Float64}
         f(rng..., 2, 3)               ::Array{Float64, 2}
         f(rng..., b2, u3)             ::Array{Float64, 2}
-        f(rng..., (2, 3))             ::Array{Float64, 2}
         for T in functypes[f]
             a0 = f(rng..., T)         ::T
             a1 = f(rng..., T, 5)      ::Vector{T}

stdlib/SharedArrays/test/runtests.jl

@@ -78,7 +78,7 @@ copyto!(s, d)
 s = SharedArrays.shmem_rand(dims)
 copyto!(s, sdata(d))
 @test s == d
-a = rand(dims)
+a = rand(Float64, dims)
 @test sdata(a) == a
 
 d = SharedArray{Int}(dims, init = D->fill!(D.loc_subarr_1d, myid()))