extract_rust() only traversed field_declaration_list (named-struct
bodies), so tuple structs -- whose positional fields nest under
ordered_field_declaration_list -- had every field type reference
silently dropped from the graph.
This is the same node shape the enum handler already accounts for
(tuple variants nest their types under ordered_field_declaration_list);
the struct path was simply left behind. Add an additive branch that,
for each type node in a tuple struct's ordered_field_declaration_list,
collects type refs via _rust_collect_type_refs and emits references
edges with the appropriate field / generic_arg context. The
named-struct path is untouched.
For `struct Wrapper(Logger, Config);` with Logger/Config defined
in-file, no field edges were produced before; both are now emitted.
Adds test_rust_tuple_struct_field_references and a tuple struct to the
shared Rust fixture covering plain and generic positional field types.
Synvoya
7eb847bcf7