// An ARRAY argument at a generic slice param (`xs: []$T`) binds T from
// the array's element type — the same array→slice promotion concrete
// slice params perform — for scalar and struct elements, with the
// return-position `T` resolving to the element type. The slice
// spelling keeps working unchanged.
//
// Regression (issue 0126): the binding extractor only accepted slice
// args, so `first(a)` left T unbound and the monomorphized body
// reached LLVM emission with the `.unresolved` sentinel (panic).

#import "modules/std.sx";

P :: struct { x: s64; y: s64; }

first :: (xs: []$T) -> T {
    return xs[0];
}

last :: (xs: []$T) -> T {
    return xs[xs.len - 1];
}

main :: () -> s32 {
    a : [3]s64 = ---;
    a[0] = 7; a[1] = 8; a[2] = 9;
    print("{}\n", first(a));
    print("{}\n", last(a));

    bs : [4]u8 = ---;
    bs[0] = 5; bs[1] = 6; bs[2] = 7; bs[3] = 8;
    print("{}\n", last(bs));

    ps : [2]P = ---;
    ps[0] = .{ x = 1, y = 2 };
    ps[1] = .{ x = 3, y = 4 };
    print("{}\n", first(ps).y);

    s : []s64 = a;
    print("{}\n", first(s));
    return 0;
}