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Strange error with abstract module types and functors #6240

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vicuna opened this issue Nov 17, 2013 · 1 comment

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commented Nov 17, 2013

Original bug ID: 6240
Reporter: @lpw25
Assigned to: @garrigue
Status: closed (set by @xavierleroy on 2015-12-11T18:25:19Z)
Resolution: fixed
Priority: normal
Severity: minor
Fixed in version: 4.01.1+dev
Category: typing

Bug description

The following type error appears to be a bug:

      OCaml version 4.01.0

module M : sig

  module type T
  module F (X : T) : sig end
end = struct
  module type T = sig end
  module F (X : T) = struct end
end;;
          module M : sig module type T module F : functor (X : T) -> sig  end end

module type T = M.T;;

module type T = M.T

module F : functor (X : T) -> sig end = M.F;;

Characters 40-43:
module F : functor (X : T) -> sig end = M.F;;
^^^
Error: Signature mismatch:
Modules do not match:
functor (X : M.T) -> sig end
is not included in
functor (X : T) -> sig end
At position functor (X : ) -> ...
Modules do not match: T is not included in M.T
At position functor (X : ) -> ...
Unbound module type M.T

@vicuna

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commented Nov 18, 2013

Comment author: @garrigue

Fixed in trunk and 4.01, revision 14299 and 14300.

In subtyping, was not expanding the external module type in functor arguments at the right timing.

@vicuna vicuna closed this Dec 11, 2015

@vicuna vicuna added the typing label Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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