Add NamedTuple constructor for iterators

src/NamedTuples.jl

@@ -161,6 +161,19 @@ end
 
 end
 
+if VERSION < v"0.7.0-DEV.2738"
+    function (::Type{NT})(itr) where {NT <: NamedTuple}
+        T = isa(NT, DataType) ? Tuple{NT.parameters...} : Tuple
+        @show T itr
+        NT(T(itr))
+    end
+else
+    # TODO: Will need to be wrapped in a VERSION check when
+    # https://github.com/JuliaLang/julia/pull/26914 is merged
+    NamedTuple{names, T}(itr) where {names, T} = NamedTuple{names, T}(T(itr))
+    NamedTuple{names}(itr) where {names} = NamedTuple{names}(Tuple(itr))
+end
+
 if VERSION < v"0.7.0-DEV.2738"
 
 # Create a NameTuple type, if a type with these field names has not already

src/deprecated.jl

@@ -12,16 +12,6 @@ if VERSION < v"0.7.0-DEV.2738"
         aexprs = [ :(args[$i]) for i = 1:n ]
         return gen_namedtuple_ctor_body(n, aexprs)
     end
-
-    # specialized for certain argument counts
-    for n = 0:5
-        args = [ Symbol("x$n") for n = 1:n ]
-        @eval function (::Type{NT})($(args...)) where {NT <: NamedTuple}
-            Base.depwarn("`$NT(args...)` is deprecated, use `$NT((args...,))` instead.",
-                         Symbol("NamedTuple(args...)"))
-            $(gen_namedtuple_ctor_body(n, args))
-        end
-    end
 end
 
 # END NamedTuples 4.1.0 deprecations

test/runtests.jl

@@ -97,3 +97,7 @@ if VERSION < v"0.7.0-DEV.2738"
 else
     @test nt.parameters[2] == Tuple{Empty, Int}
 end
+
+# Iterator constructor
+@test @NT(a::Int, b::Float64)(Any[1.0, 2]) === @NT(a=1, b=2.0)
+@test @NT(a, b)(Any[1.0, 2]) === @NT(a=1.0, b=2)