signatures

[voyager]

is there some thing like typedef?

alias int XXX;
alias int YYY;

void a1(XXX a, YYY b) {int c = a+b;}
void a1(int a, YYY b) {int c = a+b;}


gives an error:
Building Debug\bgitest.exe...
bgitest.obj : fatal error LNK1179: invalid or corrupt file: 
duplicate COMDAT '_D4main2a1FiiZv (void main.a1(int, int))'
Building Debug\bgitest.exe failed!
Details saved as 
"file://G:\PROGRAMMING\DPROG\bgitest\bgitest\Debug\bgitest.buildlog.html"
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped 
==========