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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2015-06-07 09:25:53 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@inria.fr> | 2015-06-07 09:25:53 +0200 |
| commit | 584eac7027cd4d29c5ca8744453ffeea8f18b501 (patch) | |
| tree | 374cd5c593eae420ff4e14e73de4c73709a6a87e /common/Determinism.v | |
| parent | 9f30d4984863ec655a03996646805202dc2a07c9 (diff) | |
| download | compcert-kvx-584eac7027cd4d29c5ca8744453ffeea8f18b501.tar.gz compcert-kvx-584eac7027cd4d29c5ca8744453ffeea8f18b501.zip | |
Represent external worlds by a coinductive type rather than an inductive type.
As noticed by R. Krebbers, an inductive type for external worlds implies that all sequences of program-world interactions are finite, which is not the case.
Diffstat (limited to 'common/Determinism.v')
| -rw-r--r-- | common/Determinism.v | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/common/Determinism.v b/common/Determinism.v index d0099ba9..7ea19663 100644 --- a/common/Determinism.v +++ b/common/Determinism.v @@ -36,7 +36,7 @@ Require Import Behaviors. that this external call succeeds, has result [r], and changes the world to [w]. *) -Inductive world: Type := +CoInductive world: Type := World (io: ident -> list eventval -> option (eventval * world)) (vload: memory_chunk -> ident -> int -> option (eventval * world)) (vstore: memory_chunk -> ident -> int -> eventval -> option world). |