1const expect = @import("std").testing.expect;
 2const builtin = @import("builtin");
 3
 4const FormValue = union(enum) {
 5    One: void,
 6    Two: bool,
 7};
 8
 9fn foo(id: u64) !FormValue {
10    return switch (id) {
11        2 => FormValue{ .Two = true },
12        1 => FormValue{ .One = {} },
13        else => return error.Whatever,
14    };
15}
16
17test "switch prong implicit cast" {
18    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
19    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
20    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
21
22    const result = switch (foo(2) catch unreachable) {
23        FormValue.One => false,
24        FormValue.Two => |x| x,
25    };
26    try expect(result);
27}