<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">If I declare a variable and initialize it with an array literal whose elements are integer literals and nil literals,</div><div class="">the compiler will infer the type Array<Optional<Int>> for that variable:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class="">let arr = [1, nil, 3]</font></div><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class="">print(type(of: arr)) <span class="Apple-tab-span" style="white-space:pre"> </span>// Array<Optional<Int>></font></div></div><div style="margin: 0px; line-height: normal;" class=""><br class=""></div><div class=""><div class="">However, that only works with nominal types such as Int and String. If I do the same thing with an array of tuples,</div><div class="">I get a compile error:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class="">let arr = [(1, false), nil, (3, true)]<span class="Apple-tab-span" style="white-space:pre"> </span>// error: type of expression is ambiguous without more context</font></div><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class="">print(type(of: arr))</font></div></div><div style="margin: 0px; line-height: normal;" class=""><br class=""></div><div class="">Why can't the compiler infer the type Array<Optional<(Int, Bool)>> in this example? Is there a reason for this or is it a bug?</div></div><div class=""><br class=""></div><div class="">Thanks and best regards,</div><div class="">Toni</div><div class=""><br class=""></div></body></html>