Bug 11548 – ParameterDefaultValueTuple fails to compile when passed in a function containing a parameter named "args".

From what I can tell, the template seems to use the name of the arguments as part of a lambda, while declaring "args" itself. So when one of the parameters is named args, this creates a duplicate definition and fails to compile. Sample code: import std.traits; void foo(string[] args) { } void main() { alias T = ParameterDefaultValueTuple!foo; } Output: Ognjen:~$ rdmd test.d /Users/kapps/dev/dmd/phobos/std/traits.d(1093): Error: delegate std.traits.ParameterDefaultValueTuple!(foo).Get!(0LU).__lambda2 parameter __lambda2.args is already defined /Users/kapps/dev/dmd/phobos/std/traits.d(1122): Error: template instance std.traits.ParameterDefaultValueTuple!(foo).Get!(0LU) error instantiating /Users/kapps/dev/dmd/phobos/std/traits.d(1125): instantiated from here: Impl!() test.d(20): instantiated from here: ParameterDefaultValueTuple!(foo) /Users/kapps/dev/dmd/phobos/std/traits.d(1125): Error: template instance std.traits.ParameterDefaultValueTuple!(foo).Impl!() error instantiating test.d(20): instantiated from here: ParameterDefaultValueTuple!(foo) test.d(20): Error: template instance std.traits.ParameterDefaultValueTuple!(foo) error instantiating

Fixed in Phobos P.R. #2624