diff options
| -rw-r--r-- | tvix/eval/src/value/attrs.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tvix/eval/src/value/attrs.rs b/tvix/eval/src/value/attrs.rs index 59e477db4acf..d8e3001f4a18 100644 --- a/tvix/eval/src/value/attrs.rs +++ b/tvix/eval/src/value/attrs.rs @@ -217,6 +217,13 @@ impl NixAttrs { self.0.select(key) } + /// Select a required value from an attribute set by key, return + /// an `AttributeNotFound` error if it is missing. + pub fn select_required(&self, key: &str) -> Result<&Value, ErrorKind> { + self.select(key) + .ok_or_else(|| ErrorKind::AttributeNotFound { name: key.into() }) + } + pub fn contains(&self, key: &str) -> bool { self.0.contains(key) } |