036 autodischarge no void candidate

// TEST: Auto-discharge skips multi-branch events - no valid candidate
//
// MUST_FAIL
//
// When the ONLY disposal event has multiple branches,
// auto-discharge cannot use it (multiple branches require manual handling).
// This should result in an error: obligation not satisfied.
//
// Expected: Compile error about unsatisfied obligation

// Resource with obligation
pub const Handle = struct {
    id: i32,
};

// Event that creates obligation
~event open {}
| ok *Handle[open!]

~proc open {
    const h = std.heap.page_allocator.create(Handle) catch unreachable;
    h.* = .{ .id = 42 };
    return .{ .ok = h };
}

// ONLY disposal event has branches - cannot be auto-discharged
~event close { h: *Handle[!open] }
| closed {}
| error { msg: []const u8 }

~proc close {
    std.heap.page_allocator.destroy(h);
    return .{ .closed = .{} };
}

const std = @import("std");

// Flow: open, then terminator
// No void disposal exists, so auto-discharge has no candidate
// This should ERROR - obligation not satisfied
~open()
| ok _ |> _