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type printing bug : polymorphic method #8073

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vicuna opened this issue Mar 19, 2003 · 2 comments
Closed

type printing bug : polymorphic method #8073

vicuna opened this issue Mar 19, 2003 · 2 comments
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@vicuna
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vicuna commented Mar 19, 2003

Original bug ID: 1606
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: minor
Category: ~DO NOT USE (was: OCaml general)

Bug description

cafe[14:17]%cat > bug.ml
class type ['a] o = object end
class type c = object method m : 'a. 'a #o as 'a end
cafe[14:17]%ocamlc -i bug.ml
class type ['a] o = object end
class type c = object method m : 'a #o as 'a end
cafe[14:17]%ocamlc -i bug.ml > bug.mli
cafe[14:17]%ocamlc bug.mli
File "bug.mli", line 2, characters 10-48:
Some type variables are unbound in this type:
class type c = object method m : 'a #o as 'a end
The method m has type 'a #o as 'a where .. is unbound
@vicuna
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vicuna commented Mar 20, 2003

Comment author: administrator

Fixed by JG 2003-03-20

@vicuna vicuna closed this as completed Mar 20, 2003
@vicuna
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vicuna commented Mar 20, 2003

Comment author: administrator

From: lvibert@irisa.fr

class type ['a] o = object end
class type c = object method m : 'a #o as 'a end
Some type variables are unbound in this type:
class type c = object method m : 'a #o as 'a end
The method m has type 'a #o as 'a where .. is unbound

Well spotted: aliases were not allowed in implicit polymorphic method
types. This is now fixed.
Note that they obey different scoping rules compared to normal types:
variables and aliases introduced in implicit types are local to this
type; normally they are shared in the whole expression.

    Jacques

@vicuna vicuna added the bug label Mar 19, 2019
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@vicuna