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Handle Core.TypeEq on Julia 1.14-dev #57

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Handle Core.TypeEq on Julia 1.14-dev #57

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Handle Core.TypeEq on Julia 1.14-dev
omus Aug 14, 2026
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omus Aug 17, 2026
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15 changes: 14 additions & 1 deletion src/type_utils.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,19 @@ Extracts the type-parameters of the `type`.
e.g. `parameters(Foo{A, B, C}) == [A, B, C]`
"""
parameters(sig::UnionAll) = parameters(sig.body)
parameters(sig::DataType) = sig.parameters
# Introduced in Julia 1.14.0-DEV.2291 https://github.com/JuliaLang/julia/pull/61915
# type_parameter is the officially supported way of doing this, and accessing directly is deprecated
@static if isdefined(Base, :type_parameter)
parameters(sig::DataType) = Base.type_parameter(sig)
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else
parameters(sig::DataType) = sig.parameters
end
parameters(sig::Union) = Base.uniontypes(sig)
parameters(sig::TypeVar) = [sig]

# On Julia 1.14.0-DEV.2291 `Type{ConcreteType}` may be represented via `Core.TypeEq`
# instead of `DataType`/`UnionAll`.
# https://github.com/JuliaLang/julia/pull/61915
@static if isdefined(Core, :TypeEq)
parameters(sig::Core.TypeEq) = [sig.T]
end
12 changes: 12 additions & 0 deletions test/type_utils.jl
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Expand Up @@ -72,5 +72,17 @@
@test length(w) == 1
@test first(w).args[1] == :T
end

@static if isdefined(Core, :TypeEq)
@testset "Core.TypeEq" begin
struct TypeEqTest
x
end
m = only(methods(TypeEqTest, Tuple{Any}))
constructor_type = first(parameters(m.sig))
@test constructor_type isa Core.TypeEq
@test collect(parameters(constructor_type)) == [TypeEqTest]
end
end
end
end
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