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8.9 Overriding in open statements

(Introduced in OCaml 4.01)

definition ::= ...
open! module-path
specification ::= ...
open! module-path
expr ::= ...
let open! module-path in expr
class-body-type ::= ...
let open! module-path in class-body-type
class-expr ::= ...
let open! module-path in class-expr

Since OCaml 4.01, open statements shadowing an existing identifier (which is later used) trigger the warning 44. Adding a ! character after the open keyword indicates that such a shadowing is intentional and should not trigger the warning.

This is also available (since OCaml 4.06) for local opens in class expressions and class type expressions.


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