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Diffstat (limited to 'site/docs/skylark/backward-compatibility.md')
| -rw-r--r-- | site/docs/skylark/backward-compatibility.md | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/site/docs/skylark/backward-compatibility.md b/site/docs/skylark/backward-compatibility.md index 61eabd1098..4a67bf4d2b 100644 --- a/site/docs/skylark/backward-compatibility.md +++ b/site/docs/skylark/backward-compatibility.md @@ -30,6 +30,7 @@ To check if your code will be compatible with future releases you can: The following are the backward incompatible changes that are implemented and guarded behind flags in the current release: +* [Set constructor](#set-constructor) * [Keyword-only arguments](#keyword-only-arguments) * [Mutating `+=`](#mutating) * [Dictionary concatenation](#dictionary-concatenation) @@ -43,6 +44,22 @@ guarded behind flags in the current release: * [New actions API](#new-actions-api) * [Checked arithmetic](#checked-arithmetic) +### Set constructor + +To maintain a clear distinction between the specialized [`depset`](depsets.md) +data structure and Python's native `set` datatype (which does not currently +exist in Skylark), the `set` constructor has been superseded by `depset`. It is +no longer allowed to run code that calls the old `set` constructor. + +However, for a limited time, it will not be an error to reference the `set` +constructor from code that is not executed (e.g. a function that is never +called). Enable this flag to confirm that your code does not still refer to the +old `set` constructor from unexecuted code. + +* Flag: `--incompatible_disallow_uncalled_set_constructor` +* Default: `false` + + ### Keyword-only arguments Keyword-only parameters are parameters that can be called only using their name. |