agra fa59a9dc25 refactor(ir): distinguish free-function UFCS from namespace calls in CallPlan (A3.2 review fix) ...

CallPlan collapsed two different field-access dispatches onto namespace_fn:
a true namespace call (`pkg.fn()`, no receiver) and free-function UFCS
(`c.bump()`, receiver prepended + `*T` fixup). Return typing was preserved
either way, but sub-step 3 could not consume the plan — it would have had to
re-classify the AST to decide whether to prepend the receiver.

Add a distinct `free_fn_ufcs` kind and a plan(c) branch, inserted after the
struct-method block and gated on `objectIsValue` (the negation of lowerCall's
`is_namespace`: a non-identifier receiver is always a value; an
identifier/type_expr is a value iff it names a local or a global). The branch
sets prepends_receiver = true and reads prepends_ctx from the resolved FuncId
(best-effort, like direct_fn). namespace_fn now means strictly "receiver is a
namespace/type prefix".

New test `plan: free-function UFCS prepends receiver, distinct from
namespace_fn` covers a scope-bound `c.bump()` against a lowered free fn:
asserts free_fn_ufcs kind, func target, prepends_receiver, prepends_ctx, and
preserved s32 return type.

zig build, zig build test, tests/run_examples.sh (357/0) all green; return
typing unchanged.

2026-06-02 20:33:26 +03:00

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