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problem with optional arguments when defining a type with a "Some of <type>" constructor #5075

vicuna opened this Issue Jun 15, 2010 · 1 comment


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vicuna commented Jun 15, 2010

Original bug ID: 5075
Reporter: nobelius
Status: closed (set by @garrigue on 2010-06-16T01:25:55Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 3.11.1
Fixed in version: 3.12.0+dev
Category: ~DO NOT USE (was: OCaml general)
Duplicate of: #4884

Bug description

When compiling with "ocamlc -c" the following code:
"type t = Some of int
let func ?(modifies=ref false) _ = ()"
the following error is obtained:
"File "", line 2, characters 20-29:
Error: This pattern matches values of type 'a option
but a pattern was expected which matches values of type t"
This is due to the fact that optional arguments "are actually implemented as option types". This could have been avoided if option type was defined in Pervasives but it is a built-in type.


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vicuna commented Jun 16, 2010

Comment author: @garrigue

Already fixed for 3.12.

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