fix JuliaLang#44086, missing field reordering in `NamedTuple{n,T}(::N…

…amedTuple)` (JuliaLang#44132)

base/namedtuple.jl

@@ -96,14 +96,23 @@ if nameof(@__MODULE__) === :Base
  $(Expr(:splatnew, :(NamedTuple{names,T}), :(T(args))))
 end
 
+function NamedTuple{names, T}(nt::NamedTuple) where {names, T <: Tuple}
+ if @generated
+ Expr(:new, :(NamedTuple{names, T}),
+ Any[ :(convert(fieldtype(T, $n), getfield(nt, $(QuoteNode(names[n]))))) for n in 1:length(names) ]...)
+ else
+ NamedTuple{names, T}(map(Fix1(getfield, nt), names))
+ end
+end
+
 function NamedTuple{names}(nt::NamedTuple) where {names}
  if @generated
  idx = Int[ fieldindex(nt, names[n]) for n in 1:length(names) ]
  types = Tuple{(fieldtype(nt, idx[n]) for n in 1:length(idx))...}
  Expr(:new, :(NamedTuple{names, $types}), Any[ :(getfield(nt, $(idx[n]))) for n in 1:length(idx) ]...)
  else
  types = Tuple{(fieldtype(typeof(nt), names[n]) for n in 1:length(names))...}
- NamedTuple{names, types}(Tuple(getfield(nt, n) for n in 1:length(names)))
+ NamedTuple{names, types}(map(Fix1(getfield, nt), names))
  end
 end
 
@@ -339,7 +348,7 @@ function structdiff(a::NamedTuple{an}, b::Union{NamedTuple{bn}, Type{NamedTuple{
  else
  names = diff_names(an, bn)
  types = Tuple{Any[ fieldtype(typeof(a), names[n]) for n in 1:length(names) ]...}
- NamedTuple{names,types}(map(n->getfield(a, n), names))
+ NamedTuple{names,types}(map(Fix1(getfield, a), names))
  end
 end
 

test/namedtuple.jl

@@ -333,3 +333,6 @@ end
 
 # issue #43045
 @test merge(NamedTuple(), Iterators.reverse(pairs((a=1,b=2)))) === (b = 2, a = 1)
+
+# issue #44086
+@test NamedTuple{(:x, :y, :z), Tuple{Int8, Int16, Int32}}((z=1, x=2, y=3)) === (x = Int8(2), y = Int16(3), z = Int32(1))