362674f04d
The generic-inference engine could not bind a $T from a generic-struct argument head. Four gaps, all on the inference + UFCS dispatch path: - extractTypeParam / matchTypeParam(Static) gained a parameterized_type_expr arm: recover the arg instance's recorded per-param bindings (struct_instance_bindings + the template's ordered type_params via struct_instance_author) and recurse positionally, so $T binds from Box($T) <=> Box(i64) like it does from []$T <=> []i64. This also fixes the pointer case — *Box($T) recurses into its Box($T) pointee. - The pointer_type_expr arm now falls through to match the pointee against a non-pointer arg (auto-address-of: a *Box($T) param accepts a by-value Box($T), e.g. the UFCS receiver b.m()). - ExprTyper.inferType gained a .lambda arm building the closure type from the lambda's annotations, so the UFCS binder (which types args from the raw AST before they are lowered) can bind a Closure(..) -> $R from the worker's declared return type. - A pack UFCS target (worker: Closure(..) -> $R, ..$args) now routes through the same lowerPackFnCall the direct call uses, with the receiver spliced in as args[0] (lowerPackFnCall reads only call_node.args, never the callee). Regression tests: examples/0214 (direct + UFCS closure-return pack) and examples/0215 (by-value / pointer / multi-param / nested / UFCS-auto-ref generic-struct-head inference). Suite green 728/0.
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