You can search for identifiers within the package.
in-package search v0.2.0
val default : (Parsetree.label_declaration, Parsetree.expression) Ppx_core.Std.Attribute.t
val drop_default : (Parsetree.label_declaration, unit) Ppx_core.Std.Attribute.t
val drop_if : (Parsetree.label_declaration, Parsetree.expression) Ppx_core.Std.Attribute.t