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fix(echo): patch build exhaustiveness gaps from PR #45 + TG-4 echo corpus #46

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Merged
hyperpolymath merged 1 commit into from
Jun 14, 2026
Merged

fix(echo): patch build exhaustiveness gaps from PR #45 + TG-4 echo corpus #46

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10 changes: 9 additions & 1 deletion compiler/bin/main.ml
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Expand Up @@ -167,7 +167,15 @@ let dump_tokens (filename : string) : unit =
| STRING s -> Printf.printf "STRING(%S)" s
| IDENT s -> Printf.printf "IDENT(%s)" s
| GENERATOR n -> Printf.printf "GENERATOR(%d)" n
| EOF -> print_string "EOF");
| EOF -> print_string "EOF"
| ECHOCLOSE -> print_string "ECHOCLOSE"
| LOWER -> print_string "LOWER"
| RESIDUE -> print_string "RESIDUE"
| PAIR -> print_string "PAIR"
| FST -> print_string "FST"
| SND -> print_string "SND"
| ECHOADD -> print_string "ECHOADD"
| ECHOEQ -> print_string "ECHOEQ");
print_newline ();
if tok <> EOF then loop ()
in
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2 changes: 2 additions & 0 deletions compiler/lib/typecheck.ml
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Expand Up @@ -584,6 +584,8 @@ and strand_type_of_ty (t : ty) : strand_type =
| TBool -> StrandNamed "Bool"
| TWord _ -> StrandDefault
| TTangle _ -> StrandDefault
| TProd _ -> StrandDefault
| TEcho _ -> StrandDefault

(** Convert a strand_type to a boundary element for self-crossing. *)
and strand_to_type (st : strand_type) : strand_type = st
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9 changes: 9 additions & 0 deletions compiler/test/test_roundtrip.ml
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Expand Up @@ -100,6 +100,15 @@ let basic_corpus : (string * string) list = [
("nullary def", "def x = identity");
("unary def", "def f(a) = a");
("binary def", "def f(a, b) = a + b");
(* Echo / structured-loss forms (PR #45) *)
("echoClose", "def x = echoClose(a)");
("lower", "def x = lower(a)");
("residue", "def x = residue(a)");
("pair", "def x = pair(a, b)");
("fst", "def x = fst(a)");
("snd", "def x = snd(a)");
("echoAdd", "def x = echoAdd(a, b)");
("echoEq", "def x = echoEq(a, b)");
]

(* --------------------------------------------------------------------- *)
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