Taken straight from TDPL:

void main() {
}

void transmogrify(uint) { }
void transmogrify(long) { }
void transmogrify(T)(T value) { }


unittest {
    transmogrify(42);
    transmogrify("hello");
    transmogrify(1.1);
}


test.d(28): Error: template test.transmogrify(T) conflicts with function test.transmogrify at test.d(26)


If the generic function is placed above the specialized functions, the errors will be expanded to this:

test.d(27): Error: function test.transmogrify conflicts with template test.transmogrify(T) at test.d(26)
test.d(28): Error: function test.transmogrify conflicts with template test.transmogrify(T) at test.d(26)