// Repro for issue 0151 — UFCS dot-call where `$R` is inferred from a
// worker closure's RETURN type through a variadic `..$args` pack leaves
// `$R` unresolved (SIGTRAP at LLVM emission). The DIRECT spelling
// `mymk(bx, worker, 40, 2)` resolves `$R = i64` and works; the UFCS
// spelling `bx.mymk(worker, 40, 2)` does not. Depends on no project
// symbols beyond modules/std.sx.
#import "modules/std.sx";

Box  :: struct { n: i64; }
Wrap :: struct ($R: Type) { value: R; }

mymk :: ufcs (b: Box, worker: Closure(..$args) -> $R, ..$args) -> Wrap($R) {
    f : Wrap($R) = ---;
    f.value = worker(..args);
    return f;
}

main :: () -> i32 {
    bx : Box = .{ n = 1 };
    g := bx.mymk((a: i64, b: i64) -> i64 => a + b, 40, 2);
    print("value={}\n", g.value);
    return 0;
}