Signature items

`val mk : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.signature_item_desc ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val value : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.value_description ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val type_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Asttypes.rec_flag ‑> Ppxlib_ast__.Import.Parsetree.type_declaration list ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val type_extension : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.type_extension ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val exception_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.extension_constructor ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val module_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.module_declaration ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val rec_module : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.module_declaration list ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val modtype : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.module_type_declaration ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val open_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.open_description ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val include_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.include_description ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val class_ : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.class_description list ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val class_type : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.class_type_declaration list ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val extension : ?⁠loc:loc ‑> ?⁠attrs:attrs ‑> Ppxlib_ast__.Import.Parsetree.extension ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val attribute : ?⁠loc:loc ‑> Ppxlib_ast__.Import.Parsetree.attribute ‑> Ppxlib_ast__.Import.Parsetree.signature_item`
`val text : Docstrings.text ‑> Ppxlib_ast__.Import.Parsetree.signature_item list`