remove redundant definitions of argtail and tupletail

base/base.jl

@@ -39,12 +39,12 @@ convert(::(), ::()) = ()
 convert(::Type{Tuple}, x::Tuple) = x
 
 argtail(x, rest...) = rest
-tupletail(x::Tuple) = argtail(x...)
+tail(x::Tuple) = argtail(x...)
 
 convert(T::(Type, Type...), x::(Any, Any...)) =
- tuple(convert(T[1],x[1]), convert(tupletail(T), tupletail(x))...)
+ tuple(convert(T[1],x[1]), convert(tail(T), tail(x))...)
 convert(T::(Any, Any...), x::(Any, Any...)) =
- tuple(convert(T[1],x[1]), convert(tupletail(T), tupletail(x))...)
+ tuple(convert(T[1],x[1]), convert(tail(T), tail(x))...)
 
 convert{T}(::Type{(T...)}, x::Tuple) = cnvt_all(T, x...)
 cnvt_all(T) = ()

base/tuple.jl

@@ -36,9 +36,6 @@ ntuple(f::Function, n::Integer) =
  n==5 ? (f(1),f(2),f(3),f(4),f(5),) :
  tuple(ntuple(n-2,f)..., f(n-1), f(n))
 
-argtail(x, rest...) = rest
-tail(x::Tuple) = argtail(x...)
-
 # 0 argument function
 map(f::Callable) = f()
 # 1 argument function
@@ -90,7 +87,7 @@ const tuplehash_seed = UInt === UInt64 ? 0x77cfa1eef01bca90 : 0xf01bca90
 hash(::(), h::UInt) = h + tuplehash_seed
 hash(x::(Any,), h::UInt) = hash(x[1], hash((), h))
 hash(x::(Any,Any), h::UInt) = hash(x[1], hash(x[2], hash((), h)))
-hash(x::Tuple, h::UInt) = hash(x[1], hash(x[2], hash(tupletail(x), h)))
+hash(x::Tuple, h::UInt) = hash(x[1], hash(x[2], hash(tail(x), h)))
 
 function isless(t1::Tuple, t2::Tuple)
  n1, n2 = length(t1), length(t2)

test/core.jl

@@ -1648,7 +1648,7 @@ f6426(x,t::(Type...)) = string(t)
 @test f6426(1, (1.,2.)) == "((Float64,Float64),)"
 
 # issue #6502
-f6502() = convert(Base.tupletail((Bool,Int...)), (10,))
+f6502() = convert(Base.tail((Bool,Int...)), (10,))
 @test f6502() === (10,)
 @test convert((Bool,Int...,), (true,10)) === (true,10)
 @test convert((Int,Bool...), (true,1,0)) === (1,true,false)