zig/test/behavior/bugs/14854.zig

const testing = @import("std").testing;

test {
    try testing.expect(getGeneric(u8, getU8) == 123);
}

fn getU8() callconv(.C) u8 {
    return 123;
}

fn getGeneric(comptime T: type, supplier: fn () callconv(.C) T) T {
    return supplier();
}