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authorVincent Ambo <mail@tazj.in>2022-08-11T11·56+0300
committertazjin <tazjin@tvl.su>2022-08-26T09·02+0000
commit671915837aee2908431b1d1908352fc0ab9cd628 (patch)
tree51dbc9390b14a8b41079b6d19e13060da6927724 /tvix/eval/src/value/mod.rs
parentaaa994137a89ab9d37fb83091dc7d24937898491 (diff)
fix(tvix/eval): add operation to assert boolean type r/4491
This operation is required because both sides of the logical operators
are strictly evaluated by Nix, even if the resulting value is not used
further.

For example, in our implementation of `&&`, if the left-hand side is
`true`, then the result of the expression is simply the right-hand
side value. This value must be asserted to be a boolean for the
semantics of the language to work correctly.

Change-Id: I34f5364f2a444753fa1d8b0a1a2b2d9cdf7c6700
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6157
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Diffstat (limited to 'tvix/eval/src/value/mod.rs')
-rw-r--r--tvix/eval/src/value/mod.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/tvix/eval/src/value/mod.rs b/tvix/eval/src/value/mod.rs
index 4a343797480e..99eb4c657ba5 100644
--- a/tvix/eval/src/value/mod.rs
+++ b/tvix/eval/src/value/mod.rs
@@ -91,6 +91,10 @@ impl Value {
             }),
         }
     }
+
+    pub fn is_bool(&self) -> bool {
+        matches!(self, Value::Bool(_))
+    }
 }
 
 impl Display for Value {