When I write this instance (yes I know it's incomplete):
instance[t with Addgrp[t]] Addgrp[t*t] {
fun zero() => zero[t](), zero[t]();
}
Felix gives this error:
UNRESOLVED RETURN ERROR
In complex.flx: line 55, cols 2 to 36
54: instance[t with Addgrp[t]] Addgrp[t*t] {
55: fun zero() => zero[t](), zero[t]();
***********************************
56: }
[typeofindex'] function zero<5469>: Can't resolve return type, got : <T5469>
Possibly each returned expression depends on the return type
Try adding an explicit return type annotation
Okay, let's try this:
instance[t with Addgrp[t]] Addgrp[t*t] {
fun zero(): t*t => zero[t](), zero[t]();
}
Now we get:
CLIENT ERROR
In return ((zero[t] ()), (zero[t] ()));
Wrong return type,
expected : <T5467> * <T5467>
but we got (<T5467> * <T5467>)^2
In complex.flx: line 55, cols 2 to 41
54: instance[t with Addgrp[t]] Addgrp[t*t] {
55: fun zero(): t*t => zero[t](), zero[t]();
****************************************
56: }
This makes no sense... wouldn't the return type be just <T5467> * <T5467>?
Curiously, this compiles:
instance[t with Addgrp[t]] Addgrp[t*t] {
fun zero(): t => zero[t](), zero[t]();
}
What's going on here? Am I missing something critical?
Thanks,
Chris
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