mirror of https://github.com/rust-lang/rust
119 lines
2.1 KiB
Rust
119 lines
2.1 KiB
Rust
// Check that closure captures for slice patterns are inferred correctly
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#![allow(unused_variables)]
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#![allow(dropping_references)]
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//@ run-pass
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fn arr_by_ref(x: [String; 3]) {
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let r = &x;
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let f = || {
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let [ref y, ref z @ ..] = x;
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};
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f();
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f();
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// Ensure `x` was borrowed
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drop(r);
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// Ensure that `x` wasn't moved from.
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drop(x);
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}
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fn arr_by_mut(mut x: [String; 3]) {
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let mut f = || {
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let [ref mut y, ref mut z @ ..] = x;
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};
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f();
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f();
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drop(x);
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}
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fn arr_by_move(x: [String; 3]) {
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let f = || {
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let [y, z @ ..] = x;
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};
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f();
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}
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fn arr_ref_by_ref(x: &[String; 3]) {
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let r = &x;
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let f = || {
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let [ref y, ref z @ ..] = *x;
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};
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let g = || {
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let [y, z @ ..] = x;
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};
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f();
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g();
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f();
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g();
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drop(r);
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drop(x);
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}
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fn arr_ref_by_mut(x: &mut [String; 3]) {
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let mut f = || {
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let [ref mut y, ref mut z @ ..] = *x;
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};
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f();
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f();
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let mut g = || {
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let [y, z @ ..] = x;
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// Ensure binding mode was chosen correctly:
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std::mem::swap(y, &mut z[0]);
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};
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g();
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g();
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drop(x);
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}
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fn arr_box_by_move(x: Box<[String; 3]>) {
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let f = || {
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let [y, z @ ..] = *x;
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};
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f();
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}
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fn slice_by_ref(x: &[String]) {
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let r = &x;
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let f = || {
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if let [ref y, ref z @ ..] = *x {}
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};
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let g = || {
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if let [y, z @ ..] = x {}
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};
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f();
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g();
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f();
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g();
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drop(r);
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drop(x);
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}
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fn slice_by_mut(x: &mut [String]) {
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let mut f = || {
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if let [ref mut y, ref mut z @ ..] = *x {}
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};
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f();
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f();
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let mut g = || {
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if let [y, z @ ..] = x {
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// Ensure binding mode was chosen correctly:
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std::mem::swap(y, &mut z[0]);
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}
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};
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g();
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g();
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drop(x);
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}
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fn main() {
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arr_by_ref(Default::default());
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arr_by_mut(Default::default());
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arr_by_move(Default::default());
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arr_ref_by_ref(&Default::default());
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arr_ref_by_mut(&mut Default::default());
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arr_box_by_move(Default::default());
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slice_by_ref(&<[_; 3]>::default());
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slice_by_mut(&mut <[_; 3]>::default());
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}
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