// E6BR-4 (MIXED pack source — the trap cell) — a pack-closure param-impl source
// `Closure(*Box, ..$args) -> $R` mixes a CONCRETE fixed prefix (`*Box`) with pack
// metadata (`..$args`, `$R`). The reconciled choke-point decides template-vs-author
// AT THE LEAF: `*Box` is resolved SOURCE-AWARE through `resolveCompound` while
// `..$args`/`$R` stay pack metadata via `PackResolver` — NOT a top-level
// "contains-unbound → no-author wrapper" router, which would send `*Box` down the
// global last-wins path (the trap both engines flagged). With two flat `Box`
// authors and none own, the concrete `*Box` prefix is a genuine collision and the
// build exits 1 — proving the prefix IS routed source-aware (it caught the
// ambiguity) while the pack parts did not spuriously error.
//
// Fail-before (pre-E6BR-4): the wrapped/pack source fell to the no-author
// `type_bridge.resolveTemplateSignatureType` wrapper (global last-wins, no
// diagnostic), so the `*Box` collision registered silently. Protects the pure-pack
// `Closure(..$args) -> $R` bridge in `library/modules/ffi/objc_block.sx` (0504 /
// 1302 / 1304 stay byte-identical), whose single author keeps the prefix-free path.

#import "modules/std.sx";
#import "0829-packs-param-impl-mixed-pack-source-ambiguous/a.sx";
#import "0829-packs-param-impl-mixed-pack-source-ambiguous/b.sx";

Block :: struct { tag: i32; }

Sink :: protocol(T: Type) {
    convert :: () -> T;
}

impl Sink(Block) for Closure(*Box, ..$args) -> $R {
    convert :: (self: Closure(*Box, ..$args) -> $R) -> Block {
        .{ tag = 0 }
    }
}

main :: () -> i32 {
    0
}