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fix tuple_type_head and tuple_type_tail on UnionAll #22911

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Jul 22, 2017
Merged

fix tuple_type_head and tuple_type_tail on UnionAll #22911

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4 changes: 2 additions & 2 deletions base/essentials.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -86,13 +86,13 @@ end
argtail(x, rest...) = rest
tail(x::Tuple) = argtail(x...)

tuple_type_head(T::UnionAll) = tuple_type_head(T.body)
tuple_type_head(T::UnionAll) = (@_pure_meta; UnionAll(T.var, tuple_type_head(T.body)))
function tuple_type_head(T::DataType)
@_pure_meta
T.name === Tuple.name || throw(MethodError(tuple_type_head, (T,)))
return unwrapva(T.parameters[1])
end
tuple_type_tail(T::UnionAll) = tuple_type_tail(T.body)
tuple_type_tail(T::UnionAll) = (@_pure_meta; UnionAll(T.var, tuple_type_tail(T.body)))
function tuple_type_tail(T::DataType)
@_pure_meta
T.name === Tuple.name || throw(MethodError(tuple_type_tail, (T,)))
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4 changes: 4 additions & 0 deletions test/tuple.jl
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Expand Up @@ -291,3 +291,7 @@ let

test_15703()
end

# https://github.com/JuliaLang/julia/issues/21026#issuecomment-317113307
const VecTuple21026{T} = Tuple{VecElement{T}}
@test convert(VecTuple21026, (1,)) === (VecElement(1),)