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Row a reading input's element generic instead of erasing it

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This commit is contained in:
Dennis Kobert
2026-09-13 23:33:37 +02:00
parent 781aef5f2e
commit 652c1c0e1b
4 changed files with 58 additions and 14 deletions
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10
node-graph/node-macro/src/validation.rs
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@@ -80,7 +80,8 @@ fn validate_record_io(parsed: &ParsedNodeFn) {
emit_error!(field.pat_ident.span(), "attribute-only inputs are not supported yet; the value component cannot be `()`");
}
let is_token_carrier = index == 0 && implementations.is_empty() && crate::codegen::unbounded_generic(parsed, ty).is_some();
if !is_token_carrier && crate::codegen::contains_open_generic(parsed, ty) {
// An input spelling its rows out is concrete in each of them, so its reads monomorphize with the row.
if !is_token_carrier && implementations.is_empty() && crate::codegen::contains_open_generic(parsed, ty) {
emit_error!(
field.pat_ident.span(),
"a reading input's value is monomorphic for now; use a concrete type or an unbounded passthrough generic in the primary input"
@@ -110,6 +111,9 @@ fn validate_record_io(parsed: &ParsedNodeFn) {
);
return;
};
// A carrier spelling its rows out is concrete in each of them, so its element generic is not an open one.
let carrier_rows = matches!(&carrier.ty, ParsedFieldType::Regular(RegularParsedField { implementations, .. }) if !implementations.is_empty());
let node = crate::codegen::ir::build(parsed);
if lazy_carrier && !node.derives {
emit_error!(parsed.input.pat_ident.span(), "a lazy record carrier evaluates at derived contexts; spell `impl Ctx + DeriveCtx`");
@@ -149,12 +153,12 @@ fn validate_record_io(parsed: &ParsedNodeFn) {
None => {
if let Some(ident) = crate::codegen::unbounded_generic(parsed, element) {
emit_error!(parsed.output_type.span(), "the returned generic element `{}` has no matching input", ident);
} else if !no_carrier && !node.output.gathers && crate::codegen::contains_open_generic(parsed, carrier_ty) {
} else if !no_carrier && !node.output.gathers && !carrier_rows && crate::codegen::contains_open_generic(parsed, carrier_ty) {
emit_error!(
carrier.pat_ident.span(),
"record element reads are monomorphic for now; use a concrete element type or an unbounded passthrough generic"
);
} else if !node.output.gathers && crate::codegen::contains_open_generic(parsed, element) {
} else if !node.output.gathers && !carrier_rows && crate::codegen::contains_open_generic(parsed, element) {
emit_error!(parsed.output_type.span(), "a written element must be a concrete type");
}
}