Type inference crashes in lets for numeric types

[lukaszcz]

The following

import Stdlib.Prelude open;

main : Nat :=
  let
     x : _ := 0;
     y : Nat := 1;
  in
  x + y;

crashes with

juvix: impossible: x@650 is not in the InfoTable

The following also crashes:

import Stdlib.Prelude open;

main : Int :=
  let
     x : _ := 0;
     y : Int := 1;
  in
  x - y;

The following works:

import Stdlib.Prelude open;

main : Bool :=
  let
     x : _ := true;
     y : Bool := false;
  in
  x || y;