=============== code ===============
import std.typecons : Tuple;

alias BOMSeq = Tuple!(int, "schema");

extern(C) int main(){
        return 0;
}
=========================

../src/phobos/std/range/primitives.d(405): Error: static assert  "Cannot put a const(char)[] into a Appender!string."
../../src/phobos/std/format.d(1172):        instantiated from here: put!(Appender!string, const(char)[])
./../src/phobos/std/format.d(473):        instantiated from here: writeUpToNextSpec!(Appender!string)
../../src/phobos/std/format.d(5831):        instantiated from here: formattedWrite!(Appender!string, char, ulong, ulong)
../../src/phobos/std/typecons.d(542):        instantiated from here: format!(char, ulong, ulong)
test.d(4):        instantiated from here: Tuple!(int, "schema")