1*abc8812dSJason Rice // RUN: %clang_cc1 -std=c++2c -verify -fsyntax-only %s 2*abc8812dSJason Rice 3*abc8812dSJason Rice template <unsigned N> 4*abc8812dSJason Rice void decompose_array() { 5*abc8812dSJason Rice int arr[4] = {1, 2, 3, 5}; 6*abc8812dSJason Rice auto [x, ... // #1 7*abc8812dSJason Rice rest, ...more_rest] = arr; // expected-error{{multiple packs in structured binding declaration}} 8*abc8812dSJason Rice // expected-note@#1{{previous binding pack specified here}} 9*abc8812dSJason Rice 10*abc8812dSJason Rice auto [y...] = arr; // expected-error{{'...' must immediately precede declared identifier}} 11*abc8812dSJason Rice 12*abc8812dSJason Rice auto [...] = arr; // #2 13*abc8812dSJason Rice // expected-error@#2{{expected identifier}} 14*abc8812dSJason Rice // expected-error@#2{{{no names were provided}}} 15*abc8812dSJason Rice // expected-warning@#2{{{does not allow a decomposition group to be empty}}} 16*abc8812dSJason Rice auto [a, ..., b] = arr; // #3 17*abc8812dSJason Rice // expected-error@#3{{expected identifier}} 18*abc8812dSJason Rice // expected-error@#3{{{only 1 name was provided}}} 19*abc8812dSJason Rice auto [a1, ...] = arr; // #4 20*abc8812dSJason Rice // expected-error@#4{{expected identifier}} 21*abc8812dSJason Rice // expected-error@#4{{{only 1 name was provided}}} 22*abc8812dSJason Rice auto [..., b] = arr; // #5 23*abc8812dSJason Rice // expected-error@#5{{expected identifier}} 24*abc8812dSJason Rice // expected-error@#5{{{no names were provided}}} 25*abc8812dSJason Rice } 26