If a dictionary is used as a general set, the keys should be mapped to `True` instead of `None`.

dict has a get() method that defaults to `None`.
Checking for a key in the dictionary with get() will always return `None` in the given example. Using `True` is better.

RELNOTES: None.
PiperOrigin-RevId: 201551896

1 files changed, 3 insertions, 3 deletions

diff --git a/site/docs/skylark/depsets.md b/site/docs/skylark/depsets.md
index 0199fed9d3..570ac23211 100644
--- a/site/docs/skylark/depsets.md
+++ b/site/docs/skylark/depsets.md
@@ -313,16 +313,16 @@ will appear twice on the command line and twice in the contents of the output
 file.
 
 The next alternative is using a general set, which can be simulated by a
-dictionary where the keys are the elements and all the keys map to `None`.
+dictionary where the keys are the elements and all the keys map to `True`.
 
 ```python
 def get_transitive_srcs(srcs, deps):
   trans_srcs = {}
   for dep in deps:
     for file in dep[FooFiles].transitive_sources:
-      trans_srcs[file] = None
+      trans_srcs[file] = True
   for file in srcs:
-    trans_srcs[file] = None
+    trans_srcs[file] = True
   return trans_srcs
 ```