Bug 1779 – Compiler crash when deducing more than 2 type args

The lack of compile-time reflection for class template arguments leads to the following cumbersome code: template Print(Ts ...) { pragma (msg, Ts.stringof); } template Tuple(Ts ...) { alias Ts Tuple; } template Decode( T ) { alias Tuple!() Types; } template Decode( T : TT!(U1), alias TT, U1 ) { alias Tuple!(U1) Types; } template Decode( T : TT!(U1,U2), alias TT, U1, U2 ) { alias Tuple!(U1,U2) Types; } template Decode( T : TT!(U1,U2,U3), alias TT, U1, U2, U3 ) { alias Tuple!(U1,U2,U3) Types; } // etc struct S1(T1) {} struct S2(T1, T2) {} struct S3(T1, T2, T3) {} alias Decode!( bool ).Types SQ0; alias Decode!( S1!(bool) ).Types SQ1; alias Decode!( S2!(bool,short) ).Types SQ2; //alias Decode!( S3!(bool,short,int) ).Types SQ3; // <-- crashes when uncommented mixin Print!(SQ0); mixin Print!(SQ1); mixin Print!(SQ2); //mixin Print!(SQ3); // <-- and uncomment this The compiler prints the deduced tuples as: () (bool) (bool, short) but crashes before printing the 3 arg case. Came across this issue first with ver 2.007 but still present in 2.009

Fixed dmd 1.026 and 2.010