libppx-custom-printf-ocaml 0.16.0-2 (s390x binary) in ubuntu mantic

 ppx_custom_printf is a ppx rewriter that allows the use of
 user-defined string conversion functions in format strings (that is,
 strings passed to printf, sprintf, etc.).
 .
 No new syntax is introduced. Instead a previously ill-typed use of
 the ! operator is re-purposed.
 .
 This package contains runtime files.