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.
20 // Note that even though `y` may implement `Drop`, under #54987 we
21 // will still allow partial initialization of `S` itself.
29 impl S<B> { fn new() -> Self { S { x: 0, y: Box::new(0) } } }
31 fn borrow_s(s: &S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
32 fn move_s(s: S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
33 fn borrow_field(x: &u32) { assert_eq!(*x, 10); }
36 type Tvoid = (u32, Void);
38 fn borrow_t(t: &T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
39 fn move_t(t: T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
51 impl<F> Q<F> { fn new(f: F) -> Self { Q { v: 0, r: R::new(f) } } }
52 impl<F> R<F> { fn new(f: F) -> Self { R { w: 0, f } } }
55 // * local/field: Is the structure in a local or a field
56 // * fully/partial/void: Are we fully initializing it before using any part?
57 // Is whole type empty due to a void component?
58 // * init/reinit: First initialization, or did we previously inititalize and then move out?
59 // * struct/tuple: Is this a struct or a (X, Y).
61 // As a shorthand for the cases above, adding a numeric summary to
62 // each test's fn name to denote each point on each axis.
64 // e.g., 1000 = field fully init struct; 0211 = local void reinit tuple
66 // It got pretty monotonous writing the same code over and over, and I
67 // feared I would forget details. So I abstracted some desiderata into
68 // macros. But I left the initialization code inline, because that's
69 // where the errors for #54986 will be emitted.
71 macro_rules! use_fully {
72 (struct $s:expr) => { {
73 borrow_field(& $s.x );
78 (tuple $t:expr) => { {
79 borrow_field(& $t.0 );
85 macro_rules! use_part {
86 (struct $s:expr) => { {
87 borrow_field(& $s.x );
88 match $s { S { ref x, y: _ } => { borrow_field(x); } }
91 (tuple $t:expr) => { {
92 borrow_field(& $t.0 );
93 match $t { (ref x, _) => { borrow_field(x); } }
97 fn test_0000_local_fully_init_and_use_struct() {
99 s.x = 10; s.y = Box::new(20);
100 //~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
101 use_fully!(struct s);
104 fn test_0001_local_fully_init_and_use_tuple() {
106 t.0 = 10; t.1 = Box::new(20);
107 //~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
111 fn test_0010_local_fully_reinit_and_use_struct() {
112 let mut s: S<B> = S::new(); drop(s);
113 s.x = 10; s.y = Box::new(20);
114 //~^ ERROR assign to part of moved value: `s` [E0382]
115 use_fully!(struct s);
118 fn test_0011_local_fully_reinit_and_use_tuple() {
119 let mut t: T = (0, Box::new(0)); drop(t);
120 t.0 = 10; t.1 = Box::new(20);
121 //~^ ERROR assign to part of moved value: `t` [E0382]
125 fn test_0100_local_partial_init_and_use_struct() {
128 //~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
132 fn test_0101_local_partial_init_and_use_tuple() {
135 //~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
139 fn test_0110_local_partial_reinit_and_use_struct() {
140 let mut s: S<B> = S::new(); drop(s);
142 //~^ ERROR assign to part of moved value: `s` [E0382]
146 fn test_0111_local_partial_reinit_and_use_tuple() {
147 let mut t: T = (0, Box::new(0)); drop(t);
149 //~^ ERROR assign to part of moved value: `t` [E0382]
153 fn test_0200_local_void_init_and_use_struct() {
156 //~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
160 fn test_0201_local_void_init_and_use_tuple() {
163 //~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
167 // NOTE: uniform structure of tests here makes n21n (aka combining
168 // Void with Reinit) an (even more) senseless case, as we cannot
169 // safely create initial instance containing Void to move out of and
170 // then reinitialize. While I was tempted to sidestep this via some
171 // unsafe code (eek), lets just instead not encode such tests.
173 // fn test_0210_local_void_reinit_and_use_struct() { unimplemented!() }
174 // fn test_0211_local_void_reinit_and_use_tuple() { unimplemented!() }
176 fn test_1000_field_fully_init_and_use_struct() {
178 q.r.f.x = 10; q.r.f.y = Box::new(20);
179 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
180 use_fully!(struct q.r.f);
183 fn test_1001_field_fully_init_and_use_tuple() {
185 q.r.f.0 = 10; q.r.f.1 = Box::new(20);
186 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
187 use_fully!(tuple q.r.f);
190 fn test_1010_field_fully_reinit_and_use_struct() {
191 let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
192 q.r.f.x = 10; q.r.f.y = Box::new(20);
193 //~^ ERROR assign to part of moved value: `q.r` [E0382]
194 use_fully!(struct q.r.f);
197 fn test_1011_field_fully_reinit_and_use_tuple() {
198 let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
199 q.r.f.0 = 10; q.r.f.1 = Box::new(20);
200 //~^ ERROR assign to part of moved value: `q.r` [E0382]
201 use_fully!(tuple q.r.f);
204 fn test_1100_field_partial_init_and_use_struct() {
207 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
208 use_part!(struct q.r.f);
211 fn test_1101_field_partial_init_and_use_tuple() {
214 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
215 use_part!(tuple q.r.f);
218 fn test_1110_field_partial_reinit_and_use_struct() {
219 let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
221 //~^ ERROR assign to part of moved value: `q.r` [E0382]
222 use_part!(struct q.r.f);
225 fn test_1111_field_partial_reinit_and_use_tuple() {
226 let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
228 //~^ ERROR assign to part of moved value: `q.r` [E0382]
229 use_part!(tuple q.r.f);
232 fn test_1200_field_void_init_and_use_struct() {
233 let mut q: Q<S<Void>>;
235 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
236 use_part!(struct q.r.f);
239 fn test_1201_field_void_init_and_use_tuple() {
242 //~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
243 use_part!(tuple q.r.f);
248 // fn test_1210_field_void_reinit_and_use_struct() { unimplemented!() }
249 // fn test_1211_field_void_reinit_and_use_tuple() { unimplemented!() }
251 // The below are some additional cases of interest that have been
252 // transcribed from other bugs based on old erroneous codegen when we
253 // encountered partial writes.
256 let mut c = (1, "".to_owned());
259 c.0 = 2; //~ ERROR assign to part of moved value
266 let mut c = (1, (1, "".to_owned()));
269 (c.1).0 = 2; //~ ERROR assign to part of moved value
270 assert_eq!((c2.1).0, 1);
274 let mut c = (1, (1, (1, "".to_owned())));
277 ((c.1).1).0 = 3; //~ ERROR assign to part of moved value
278 assert_eq!((c2.1).0, 1);
284 test_0000_local_fully_init_and_use_struct();
285 test_0001_local_fully_init_and_use_tuple();
286 test_0010_local_fully_reinit_and_use_struct();
287 test_0011_local_fully_reinit_and_use_tuple();
288 test_0100_local_partial_init_and_use_struct();
289 test_0101_local_partial_init_and_use_tuple();
290 test_0110_local_partial_reinit_and_use_struct();
291 test_0111_local_partial_reinit_and_use_tuple();
292 test_0200_local_void_init_and_use_struct();
293 test_0201_local_void_init_and_use_tuple();
294 // test_0210_local_void_reinit_and_use_struct();
295 // test_0211_local_void_reinit_and_use_tuple();
296 test_1000_field_fully_init_and_use_struct();
297 test_1001_field_fully_init_and_use_tuple();
298 test_1010_field_fully_reinit_and_use_struct();
299 test_1011_field_fully_reinit_and_use_tuple();
300 test_1100_field_partial_init_and_use_struct();
301 test_1101_field_partial_init_and_use_tuple();
302 test_1110_field_partial_reinit_and_use_struct();
303 test_1111_field_partial_reinit_and_use_tuple();
304 test_1200_field_void_init_and_use_struct();
305 test_1201_field_void_init_and_use_tuple();
306 // test_1210_field_void_reinit_and_use_struct();
307 // test_1211_field_void_reinit_and_use_tuple();