Bug 771 – template func returns delegate w. param list from tuple and type, odd compiler error

Trying to compile the following code: void delegate(T, S) Concat(S, T...)(void delegate(T) one, void delegate(S) two) { return( delegate void(T t, S s){} ); } void main() { void delegate(char, char, int) wtf=Concat( delegate void(char a, char b) {}, delegate void(int lol) {} ); } I run into the somewhat confusing compiler error: test2.d(24): Error: cannot implicitly convert expression ((Concat)(__dgliteral2, __dgliteral3)) of type void delegate((char _param_0, char _param_1), S) to void delegate(char, char, int) So it looks as if the S type doesn't get substituted at all. If this usage of tuples is invalid, please say so in the docs. Otherwise, recommendations for workarounds or a solution would be greatly appreciated. Greetings.

Added to DStress as http://dstress.kuehne.cn/run/t/tuple_12_A.d http://dstress.kuehne.cn/run/t/tuple_12_B.d

Fixed DMD 1.00