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fix(tvix/eval): determine meaning of + exprs based on first type

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This matches the behavior of C++ Nix more closely where the decision is
made based on the first type based to ExprConcatStrings:
1f93fa2ed2/src/libexpr/eval.cc (L1967-L2025)

Note that this doesn't make a difference in any successful
evaluation (at least to my knowledge), but ensures that our error
messages will match C++ Nix more closely, e.g. in the case of
`1 + "string"`.

Change-Id: I8059930788f9c8d98baf98e3d93d8a060ef961f2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10360
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
This commit is contained in:
sterni 2023-12-13 14:06:38 +01:00 committed by clbot
parent 8b0047e277
commit a30dd0905a
1 changed files with 11 additions and 5 deletions
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16
tvix/eval/src/vm/mod.rs
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@ -1202,6 +1202,7 @@ async fn resolve_with(
// TODO(amjoseph): de-asyncify this
async fn add_values(co: GenCo, a: Value, b: Value) -> Result<Value, ErrorKind> {
// What we try to do is solely determined by the type of the first value!
let result = match (a, b) {
(Value::Path(p), v) => {
let mut path = p.to_string_lossy().into_owned();
@ -1218,11 +1219,16 @@ async fn add_values(co: GenCo, a: Value, b: Value) -> Result<Value, ErrorKind> {
.await
.map(|s2| Value::String(s1.concat(&s2)))
.into(),
(v, Value::String(s2)) => generators::request_string_coerce(&co, v, CoercionKind::Weak)
.await
.map(|s1| Value::String(s1.concat(&s2)))
.into(),
(a, b) => arithmetic_op!(&a, &b, +)?,
(a @ Value::Integer(_), b) | (a @ Value::Float(_), b) => arithmetic_op!(&a, &b, +)?,
(a, b) => {
let r1 = generators::request_string_coerce(&co, a, CoercionKind::Weak).await;
let r2 = generators::request_string_coerce(&co, b, CoercionKind::Weak).await;
match (r1, r2) {
(Ok(s1), Ok(s2)) => Value::String(s1.concat(&s2)),
(Err(c), _) => return Ok(Value::Catchable(c)),
(_, Err(c)) => return Ok(Value::Catchable(c)),
}
}
};
Ok(result)