1 // This test enumerates various cases of interest for partial
2 // [re]initialization of ADTs and tuples.
4 // See rust-lang/rust#21232, rust-lang/rust#54986, and rust-lang/rust#54987.
6 // All of tests in this file are expected to change from being
7 // rejected, at least under NLL (by rust-lang/rust#54986) to being
8 // **accepted** when rust-lang/rust#54987 is implemented.
9 // (That's why there are assertions in the code.)
11 // See issue-21232-partial-init-and-erroneous-use.rs for cases of
12 // tests that are meant to continue failing to compile once
13 // rust-lang/rust#54987 is implemented.
18 // Note that even though `y` may implement `Drop`, under #54987 we
19 // will still allow partial initialization of `S` itself.
27 impl S<B> { fn new() -> Self { S { x: 0, y: Box::new(0) } } }
29 fn borrow_s(s: &S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
30 fn move_s(s: S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
31 fn borrow_field(x: &u32) { assert_eq!(*x, 10); }
34 type Tvoid = (u32, Void);
36 fn borrow_t(t: &T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
37 fn move_t(t: T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
49 impl<F> Q<F> { fn new(f: F) -> Self { Q { v: 0, r: R::new(f) } } }
50 impl<F> R<F> { fn new(f: F) -> Self { R { w: 0, f } } }
53 // * local/field: Is the structure in a local or a field
54 // * fully/partial/void: Are we fully initializing it before using any part?
55 // Is whole type empty due to a void component?
56 // * init/reinit: First initialization, or did we previously initialize and then move out?
57 // * struct/tuple: Is this a struct or a (X, Y).
59 // As a shorthand for the cases above, adding a numeric summary to
60 // each test's fn name to denote each point on each axis.
62 // e.g., 1000 = field fully init struct; 0211 = local void reinit tuple
64 // It got pretty monotonous writing the same code over and over, and I
65 // feared I would forget details. So I abstracted some desiderata into
66 // macros. But I left the initialization code inline, because that's
67 // where the errors for #54986 will be emitted.
69 macro_rules! use_fully {
70 (struct $s:expr) => { {
71 borrow_field(& $s.x );
76 (tuple $t:expr) => { {
77 borrow_field(& $t.0 );
83 macro_rules! use_part {
84 (struct $s:expr) => { {
85 borrow_field(& $s.x );
86 match $s { S { ref x, y: _ } => { borrow_field(x); } }
89 (tuple $t:expr) => { {
90 borrow_field(& $t.0 );
91 match $t { (ref x, _) => { borrow_field(x); } }
95 fn test_0000_local_fully_init_and_use_struct() {
97 s.x = 10; s.y = Box::new(20); //~ ERROR E0381
101 fn test_0001_local_fully_init_and_use_tuple() {
103 t.0 = 10; t.1 = Box::new(20); //~ ERROR E0381
107 fn test_0010_local_fully_reinit_and_use_struct() {
108 let mut s: S<B> = S::new(); drop(s);
109 s.x = 10; s.y = Box::new(20);
110 //~^ ERROR assign to part of moved value: `s` [E0382]
111 use_fully!(struct s);
114 fn test_0011_local_fully_reinit_and_use_tuple() {
115 let mut t: T = (0, Box::new(0)); drop(t);
116 t.0 = 10; t.1 = Box::new(20);
117 //~^ ERROR assign to part of moved value: `t` [E0382]
121 fn test_0100_local_partial_init_and_use_struct() {
123 s.x = 10; //~ ERROR E0381
127 fn test_0101_local_partial_init_and_use_tuple() {
129 t.0 = 10; //~ ERROR E0381
133 fn test_0110_local_partial_reinit_and_use_struct() {
134 let mut s: S<B> = S::new(); drop(s);
136 //~^ ERROR assign to part of moved value: `s` [E0382]
140 fn test_0111_local_partial_reinit_and_use_tuple() {
141 let mut t: T = (0, Box::new(0)); drop(t);
143 //~^ ERROR assign to part of moved value: `t` [E0382]
147 fn test_0200_local_void_init_and_use_struct() {
149 s.x = 10; //~ ERROR E0381
153 fn test_0201_local_void_init_and_use_tuple() {
155 t.0 = 10; //~ ERROR E0381
159 // NOTE: uniform structure of tests here makes n21n (aka combining
160 // Void with Reinit) an (even more) senseless case, as we cannot
161 // safely create initial instance containing Void to move out of and
162 // then reinitialize. While I was tempted to sidestep this via some
163 // unsafe code (eek), lets just instead not encode such tests.
165 // fn test_0210_local_void_reinit_and_use_struct() { unimplemented!() }
166 // fn test_0211_local_void_reinit_and_use_tuple() { unimplemented!() }
168 fn test_1000_field_fully_init_and_use_struct() {
170 q.r.f.x = 10; q.r.f.y = Box::new(20); //~ ERROR E0381
171 use_fully!(struct q.r.f);
174 fn test_1001_field_fully_init_and_use_tuple() {
176 q.r.f.0 = 10; q.r.f.1 = Box::new(20); //~ ERROR E0381
177 use_fully!(tuple q.r.f);
180 fn test_1010_field_fully_reinit_and_use_struct() {
181 let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
182 q.r.f.x = 10; q.r.f.y = Box::new(20);
183 //~^ ERROR assign to part of moved value: `q.r` [E0382]
184 use_fully!(struct q.r.f);
187 fn test_1011_field_fully_reinit_and_use_tuple() {
188 let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
189 q.r.f.0 = 10; q.r.f.1 = Box::new(20);
190 //~^ ERROR assign to part of moved value: `q.r` [E0382]
191 use_fully!(tuple q.r.f);
194 fn test_1100_field_partial_init_and_use_struct() {
196 q.r.f.x = 10; //~ ERROR E0381
197 use_part!(struct q.r.f);
200 fn test_1101_field_partial_init_and_use_tuple() {
202 q.r.f.0 = 10; //~ ERROR E0381
203 use_part!(tuple q.r.f);
206 fn test_1110_field_partial_reinit_and_use_struct() {
207 let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
209 //~^ ERROR assign to part of moved value: `q.r` [E0382]
210 use_part!(struct q.r.f);
213 fn test_1111_field_partial_reinit_and_use_tuple() {
214 let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
216 //~^ ERROR assign to part of moved value: `q.r` [E0382]
217 use_part!(tuple q.r.f);
220 fn test_1200_field_void_init_and_use_struct() {
221 let mut q: Q<S<Void>>;
222 q.r.f.x = 10; //~ ERROR E0381
223 use_part!(struct q.r.f);
226 fn test_1201_field_void_init_and_use_tuple() {
228 q.r.f.0 = 10; //~ ERROR E0381
229 use_part!(tuple q.r.f);
234 // fn test_1210_field_void_reinit_and_use_struct() { unimplemented!() }
235 // fn test_1211_field_void_reinit_and_use_tuple() { unimplemented!() }
237 // The below are some additional cases of interest that have been
238 // transcribed from other bugs based on old erroneous codegen when we
239 // encountered partial writes.
242 let mut c = (1, "".to_owned());
245 c.0 = 2; //~ ERROR assign to part of moved value
252 let mut c = (1, (1, "".to_owned()));
255 (c.1).0 = 2; //~ ERROR assign to part of moved value
256 assert_eq!((c2.1).0, 1);
260 let mut c = (1, (1, (1, "".to_owned())));
263 ((c.1).1).0 = 3; //~ ERROR assign to part of moved value
264 assert_eq!((c2.1).0, 1);
270 test_0000_local_fully_init_and_use_struct();
271 test_0001_local_fully_init_and_use_tuple();
272 test_0010_local_fully_reinit_and_use_struct();
273 test_0011_local_fully_reinit_and_use_tuple();
274 test_0100_local_partial_init_and_use_struct();
275 test_0101_local_partial_init_and_use_tuple();
276 test_0110_local_partial_reinit_and_use_struct();
277 test_0111_local_partial_reinit_and_use_tuple();
278 test_0200_local_void_init_and_use_struct();
279 test_0201_local_void_init_and_use_tuple();
280 // test_0210_local_void_reinit_and_use_struct();
281 // test_0211_local_void_reinit_and_use_tuple();
282 test_1000_field_fully_init_and_use_struct();
283 test_1001_field_fully_init_and_use_tuple();
284 test_1010_field_fully_reinit_and_use_struct();
285 test_1011_field_fully_reinit_and_use_tuple();
286 test_1100_field_partial_init_and_use_struct();
287 test_1101_field_partial_init_and_use_tuple();
288 test_1110_field_partial_reinit_and_use_struct();
289 test_1111_field_partial_reinit_and_use_tuple();
290 test_1200_field_void_init_and_use_struct();
291 test_1201_field_void_init_and_use_tuple();
292 // test_1210_field_void_reinit_and_use_struct();
293 // test_1211_field_void_reinit_and_use_tuple();