0004534: Confusing error message

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0004534

OCaml

~DO NOT USE (was: OCaml general)

public

2008-04-12 22:43

2010-04-30 07:18

Reporter

turpin

Assigned To

Priority

normal

Severity

feature

Reproducibility

always

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

3.10.2

Target Version

Fixed in Version

3.12.0+dev

Summary

0004534: Confusing error message

Description

file delme.ml, no .mli:

module type T = sig
  val foo : unit
  val foo : unit
end

yields the following error message, which is meaningless and totally different from what we would get with modules:

The implementation delme.ml
does not match the interface (inferred signature):
Module type declarations do not match:
  module type T = sig val foo : unit val foo : int end
does not match
  module type T = sig val foo : unit val foo : int end
Modules do not match:
  sig val foo : unit val foo : int end
is not included in
  sig val foo : unit val foo : int end
Values do not match: val foo : int is not included in val foo : unit

If I put the module type inside a module, the message beomes:

The implementation delme.ml
does not match the interface (inferred signature):
Modules do not match:
  sig module type T = sig val foo : unit val foo : unit end end
is not included in
  sig module type T = sig val foo : unit val foo : unit end end
Module type declarations do not match:
  module type T = sig val foo : unit val foo : unit end
does not match
  module type T = sig val foo : unit val foo : unit end
Illegal permutation of structure fields

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Notes
(0004568) doligez (administrator) 2008-08-04 17:06	Can't reproduce with 3.11+dev14 or 3.10.3+dev2: I get the second error message in both cases. I'm filing this as a feature wish: we should refuse a module type that has duplicate field names, with a specific error message.

(0005425) garrigue (manager) 2010-04-30 07:18	Fixed by release 10263 (only keep the last field with same name in module types).

Issue History
Date Modified	Username	Field	Change
2008-04-12 22:43	turpin	New Issue
2008-08-04 17:06	doligez	Note Added: 0004568
2008-08-04 17:06	doligez	Severity	minor => feature
2008-08-04 17:06	doligez	Status	new => acknowledged
2010-04-30 07:18	garrigue	Note Added: 0005425
2010-04-30 07:18	garrigue	Status	acknowledged => closed
2010-04-30 07:18	garrigue	Resolution	open => fixed
2010-04-30 07:18	garrigue	Fixed in Version	=> 3.12.0+dev
2017-02-23 16:36	doligez	Category	OCaml general => -OCaml general
2017-03-03 17:55	doligez	Category	-OCaml general => -(deprecated) general
2017-03-03 18:01	doligez	Category	-(deprecated) general => ~deprecated (was: OCaml general)
2017-03-06 17:04	doligez	Category	~deprecated (was: OCaml general) => ~DO NOT USE (was: OCaml general)