# Module Ast_helper.Typ

    module Typ: sig .. end

Type expressions

    val mk : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs -> Parsetree.core_type_desc -> Parsetree.core_type

    val attr : Parsetree.core_type -> Parsetree.attribute -> Parsetree.core_type

    val any : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> unit -> Parsetree.core_type

    val var : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs -> string -> Parsetree.core_type

    val arrow : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Asttypes.arg_label ->
           Parsetree.core_type -> Parsetree.core_type -> Parsetree.core_type

    val tuple : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs -> Parsetree.core_type list -> Parsetree.core_type

    val constr : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Ast_helper.lid -> Parsetree.core_type list -> Parsetree.core_type

    val object_ : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Parsetree.object_field list -> Asttypes.closed_flag -> Parsetree.core_type

    val class_ : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Ast_helper.lid -> Parsetree.core_type list -> Parsetree.core_type

    val alias : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Parsetree.core_type -> string -> Parsetree.core_type

    val variant : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Parsetree.row_field list ->
           Asttypes.closed_flag -> Asttypes.label list option -> Parsetree.core_type

    val poly : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Ast_helper.str list -> Parsetree.core_type -> Parsetree.core_type

    val package : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs ->
           Ast_helper.lid ->
           (Ast_helper.lid * Parsetree.core_type) list -> Parsetree.core_type

    val extension : ?loc:Ast_helper.loc ->
           ?attrs:Ast_helper.attrs -> Parsetree.extension -> Parsetree.core_type

    val force_poly : Parsetree.core_type -> Parsetree.core_type

    val varify_constructors : Ast_helper.str list -> Parsetree.core_type -> Parsetree.core_type

`varify_constructors newtypes te` is type expression `te`, of which any of nullary type constructor `tc` is replaced by type variable of the same name, if `tc`'s name appears in `newtypes`. Raise `Syntaxerr.Variable_in_scope` if any type variable inside `te` appears in `newtypes`.

- Since 4.05