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| author | Adam Joseph <adam@westernsemico.com> | 2023-12-11T08·43-0800 |
|---|---|---|
| committer | clbot <clbot@tvl.fyi> | 2023-12-12T14·35+0000 |
| commit | c956138ee6c158c12f5c5eb3568aea1b0aea7494 (patch) | |
| tree | a2b33d7f00d219e63295a09d4e22d9beba4e6ffa /tvix/eval/src/value | |
| parent | ddba4d4e173e13d69274b39dd6add1a3efe2343f (diff) | |
docs(tvix/eval): clarify difference between ThunkSet and Blackhole r/7174
The comment explaining ThunkSet makes it seem like it does the same think as ThunkRepr::Blackhole. In fact neither one is a substitute for the other. Let's explain the difference. Change-Id: I89ceaaa9d3c499edbc7d48f70ca5d11f97666c43 Reviewed-on: https://cl.tvl.fyi/c/depot/+/10250 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: Adam Joseph <adam@westernsemico.com>
Diffstat (limited to 'tvix/eval/src/value')
| -rw-r--r-- | tvix/eval/src/value/thunk.rs | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/tvix/eval/src/value/thunk.rs b/tvix/eval/src/value/thunk.rs index 345903237b76..cafa8275dec6 100644 --- a/tvix/eval/src/value/thunk.rs +++ b/tvix/eval/src/value/thunk.rs @@ -413,8 +413,11 @@ impl TotalDisplay for Thunk { } } -/// A wrapper type for tracking which thunks have already been seen in a -/// context. This is necessary for cycle detection. +/// A wrapper type for tracking which thunks have already been seen +/// in a context. This is necessary for printing and deeply forcing +/// cyclic non-diverging data structures like `rec { f = [ f ]; }`. +/// This is separate from the ThunkRepr::Blackhole mechanism, which +/// detects diverging data structures like `(rec { f = f; }).f`. /// /// The inner `HashSet` is not available on the outside, as it would be /// potentially unsafe to interact with the pointers in the set. |