Melange_compiler_libs.Patternslet omega: Typedtree.pattern;aka. "Tpat_any" or "_"
let omegas: int => list(Typedtree.pattern);List.init (fun _ -> omega)
let omega_list: list('a) => list(Typedtree.pattern);List.map (fun _ -> omega)
module Non_empty_row: { ... };module Simple: { ... };module Half_simple: { ... };module General: { ... };module Head: { ... };