Module Ppx_template_expander.With_constraint

convert mty sig_ returns the module type corresponding to

  mty [@with: sig_]

where sig_ has already been monomorphized by ppx_template.

Only some constructs have meaning in sig_

• include sig end and [%%template:] are inlined
• doc comments are preserved and attached to a best-effort relevant node within the final module type
• type, module, and module type bindings (e.g. type t = t or module type S := S) are converted to with constraints on mty

• module M : sig ... end is used to construct contsraints with multi-part identifier paths, e.g.

    module M : sig
      type t := t
    end

  produces a with type M.t := t constraint