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Diagnose a materializing node's missing InjectIndex and Copy bounds

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This commit is contained in:
Dennis Kobert
2026-08-14 21:31:14 +00:00
parent fdf13f91cb
commit a717403db8
2 changed files with 26 additions and 1 deletions
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25
node-graph/node-macro/src/validation.rs
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@@ -15,6 +15,7 @@ pub fn validate_node_fn(parsed: &ParsedNodeFn) -> syn::Result<()> {
validate_lend_fields,
validate_record_io,
validate_lazy_reads,
validate_materialized_ctx,
];
for validator in validators {
@@ -250,6 +251,30 @@ fn validate_async_source(parsed: &ParsedNodeFn) {
}
}
fn validate_materialized_ctx(parsed: &ParsedNodeFn) {
let materialized = parsed
.fields
.iter()
.any(|field| matches!(&field.ty, ParsedFieldType::Regular(RegularParsedField { list_levels, .. }) if *list_levels > 0));
if !materialized {
return;
}
let Some(ctx) = crate::codegen::classify::context_param(parsed) else { return };
let has = |name: &str| {
ctx.bounds
.iter()
.any(|bound| matches!(bound, syn::TypeParamBound::Trait(bound) if bound.path.segments.last().is_some_and(|segment| segment.ident == name)))
};
let missing: Vec<&str> = ["InjectIndex", "Copy"].into_iter().filter(|name| !has(name)).collect();
if !missing.is_empty() {
emit_error!(
parsed.input.pat_ident.span(),
"a node folding a ranked `List` input drives `eval_batch` over it, so its context must add `{}`; spell `impl Ctx + InjectIndex + Copy`",
missing.join(" + ")
);
}
}
fn validate_lend_fields(parsed: &ParsedNodeFn) {
let future_kernel = crate::codegen::is_source_kernel(&parsed.output_type);
for field in &parsed.fields {