Fatal error: exception File "bytecomp/translcore.ml", line 1167, characters 12-18: Assertion failed

[yallop]

a.ml:

macro m = << print_endline >>

b.ml:

macro m () = $(~A.m)

bug:

$ ocamlc a.ml b.ml 
Fatal error: exception File "bytecomp/translcore.ml", line 1167, characters 12-18: Assertion failed

[OlivierNicole]

This should yield a phase error during the typing phase. A toplevel splice in a macro implies more than two execution phases (~A.m is of phase 2) whereas currently we only support two phases (0 and 1).

While having more than two phases makes conceptual sense, there would be a complexity cost in supporting it (an unknown number of top-level splice execution and replacement stages, instead of just one).

[xnning]

I'm inclined to think about that as we have two phases (compile-time and runtime) but multiple levels. Perhaps it wouldn't be right to think about that as a phase 2 computation anyway, as it is not necessarily evaluated before all 1 phase programs.