add $nothing and tests (#2995)

2021-02-02 00:23:12 -06:00
parent 2c52144f41
commit fd41fa31d5
2 changed files with 28 additions and 0 deletions
--- a/crates/nu-engine/src/evaluate/evaluator.rs
+++ b/crates/nu-engine/src/evaluate/evaluator.rs
@ -253,6 +253,11 @@ fn evaluate_reference(name: &str, ctx: &EvaluationContext, tag: Tag) -> Result<V
            )),
        },

+        "$nothing" => Ok(Value {
+            value: UntaggedValue::nothing(),
+            tag,
+        }),
+
        x => match ctx.scope.get_var(x) {
            Some(v) => Ok(v),
            None => Err(ShellError::labeled_error(