b48766d153
A generic struct can take a pack type-param ..$Ts: []Type that binds the remaining type args as a sequence, and a pack-shaped tuple field (..$Ts) resolves to a tuple of those per-position types. - parser/ast: accept a leading .. on a struct generic param; StructTypeParam gains is_variadic. - registration: TemplateParam carries is_variadic (and is a type param). - instantiateGenericStruct: a variadic type-param consumes the remaining args into pack_bindings + pack_arg_types (mangled into the name); restored after. - resolveTypeWithBindings: a tuple-literal-as-type containing a pack spread (e.g. (..$Ts)) expands via packTypeElems. Instantiate + correct per-position field types + whole-tuple store + element read all work (examples/205). Not yet: protocol-applied field (..F(Ts)) (the canonical (..VL(Ts)) shape) and nested element assignment b.pair.0 = v. 240 examples + unit green.
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