Various bugfixes and improvements

- Rename DeIid to Operator. It corresponds to operator <string> in the
  syntax. The previous name is from when it was called deinfix in
  sail1.

- Removed things that weren't actually common from
  pretty_print_common.ml, e.g. printing identifiers is backend
  specific. The doc_id function here was only used for a very specific
  use case in pretty_print_lem, so I simplified it and renamed it to
  doc_sia_id, as it is always used for a SIA.Id whatever that is.

- There is some support for anonymous records in constructors, e.g.

  union Foo ('a : Type) = {
    MkFoo : { field1 : 'a, field2 : int }
  }

  somewhat similar to the enum syntax in Rust. I'm not sure when this
  was added, but there were a few odd things about it. It was
  desugared in the preprocessor, rather than initial_check, and the
  desugaring generated incorrect code for polymorphic anonymous
  records as above.

  I moved the code to initial_check, so the pre-processor now just
  deals with pre-processor things and not generating types, and I
  fixed the code to work with polymorphic types. This revealed some
  issues in the C backend w.r.t. polymorphic structs, which is the
  bulk of this commit. I also added some tests for this feature.

- OCaml backend can now generate a valid string_of function for
  polymorphic structs, previously this would cause the ocaml to fail
  to compile.

- Some cleanup in the Sail ott definition

- Add support for E_var in interpreter previously this would just
  cause the interpreter to fail

1 files changed, 1 insertions, 1 deletions

diff --git a/src/constant_propagation.ml b/src/constant_propagation.ml
index 6caa5ecd..5c99a534 100644
--- a/src/constant_propagation.ml
+++ b/src/constant_propagation.ml
@@ -408,7 +408,7 @@ let const_props defs ref_vars =
           let env1 = env_of e1_no_casts in
           let is_equal id =
             List.exists (fun id' -> Id.compare id id' == 0)
-              (Env.get_overloads (Id_aux (DeIid "==", Parse_ast.Unknown))
+              (Env.get_overloads (Id_aux (Operator "==", Parse_ast.Unknown))
                  env1)
           in
           let substs_true =