use borrow_check::borrow_set::BorrowData;
use borrow_check::nll::region_infer::Cause;
use borrow_check::{Context, MirBorrowckCtxt, WriteKind};
-use rustc::mir::{Local, Location, Place, TerminatorKind};
+use rustc::mir::{FakeReadCause, Local, Location, Place, StatementKind, TerminatorKind};
use rustc_errors::DiagnosticBuilder;
use rustc::ty::Region;
if spans.for_closure() {
"borrow later captured here by closure"
} else {
- "borrow later used here"
+ // Check if the location represents a `FakeRead`, and adapt the error
+ // message to the `FakeReadCause` it is from: in particular,
+ // the ones inserted in optimized `let var = <expr>` patterns.
+ let is_fake_read_for_let = match self.mir.basic_blocks()[location.block]
+ .statements
+ .get(location.statement_index)
+ {
+ None => false,
+ Some(stmt) => {
+ if let StatementKind::FakeRead(ref cause, _) = stmt.kind {
+ match cause {
+ FakeReadCause::ForLet => true,
+ _ => false,
+ }
+ } else {
+ false
+ }
+ }
+ };
+
+ if is_fake_read_for_let {
+ "borrow later stored here"
+ } else {
+ "borrow later used here"
+ }
}
};
err.span_label(spans.var_or_use(), message);
error[E0597]: `a` does not live long enough
--> $DIR/borrowing.rs:24:9
|
+LL | let _b = {
+ | -- borrow later stored here
+LL | let a = 3;
LL | / || {
LL | | yield &a
LL | | //~^ ERROR: `a` does not live long enough
| |_________^ borrowed value does not live long enough
LL | };
| - `a` dropped here while still borrowed
-LL | }
- | - borrow later used here, when `_b` is dropped
error: aborting due to 2 previous errors
error[E0597]: `i` does not live long enough
--> $DIR/regions-steal-closure.rs:24:28
|
+LL | let mut cl_box = {
+ | ---------- borrow later stored here
+LL | let mut i = 3;
LL | box_it(Box::new(|| i += 1)) //~ ERROR `i` does not live long enough
| -- ^ borrowed value does not live long enough
| |
| value captured here
LL | };
| - `i` dropped here while still borrowed
-LL | cl_box.cl.call_mut(());
- | --------- borrow later used here
error: aborting due to previous error
error[E0597]: `a` does not live long enough
--> $DIR/range-2.rs:17:9
|
+LL | let r = {
+ | - borrow later stored here
+...
LL | &a..&b
| ^^ borrowed value does not live long enough
LL | };
| - `a` dropped here while still borrowed
-...
-LL | r.use_ref();
- | - borrow later used here
error[E0597]: `b` does not live long enough
--> $DIR/range-2.rs:17:13
|
+LL | let r = {
+ | - borrow later stored here
+...
LL | &a..&b
| ^^ borrowed value does not live long enough
LL | };
| - `b` dropped here while still borrowed
-...
-LL | r.use_ref();
- | - borrow later used here
error: aborting due to 2 previous errors
error[E0597]: `x` does not live long enough
--> $DIR/send-is-not-static-ensures-scoping.rs:26:17
|
+LL | let bad = {
+ | --- borrow later stored here
+LL | let x = 1;
LL | let y = &x;
| ^^ borrowed value does not live long enough
...
LL | };
| - `x` dropped here while still borrowed
-LL |
-LL | bad.join();
- | --- borrow later used here
error[E0597]: `y` does not live long enough
--> $DIR/send-is-not-static-ensures-scoping.rs:30:22
|
+LL | let bad = {
+ | --- borrow later stored here
+...
LL | scoped(|| {
| -- value captured here
LL | let _z = y;
...
LL | };
| - `y` dropped here while still borrowed
-LL |
-LL | bad.join();
- | --- borrow later used here
error: aborting due to 2 previous errors
error[E0597]: `x` does not live long enough
--> $DIR/send-is-not-static-std-sync-2.rs:21:20
|
+LL | let lock = {
+ | ---- borrow later stored here
+LL | let x = 1;
LL | Mutex::new(&x)
| ^^ borrowed value does not live long enough
LL | };
| - `x` dropped here while still borrowed
-...
-LL | let _dangling = *lock.lock().unwrap();
- | ---- borrow later used here
error[E0597]: `x` does not live long enough
--> $DIR/send-is-not-static-std-sync-2.rs:31:21
|
+LL | let lock = {
+ | ---- borrow later stored here
+LL | let x = 1;
LL | RwLock::new(&x)
| ^^ borrowed value does not live long enough
LL | };
| - `x` dropped here while still borrowed
-LL | //~^^ ERROR `x` does not live long enough
-LL | let _dangling = *lock.read().unwrap();
- | ---- borrow later used here
error[E0597]: `x` does not live long enough
--> $DIR/send-is-not-static-std-sync-2.rs:41:25
error[E0597]: `pointer` does not live long enough
--> $DIR/wf-method-late-bound-regions.rs:30:18
|
+LL | let dangling = {
+ | -------- borrow later stored here
+LL | let pointer = Box::new(42);
LL | f2.xmute(&pointer)
| ^^^^^^^^ borrowed value does not live long enough
LL | };
| - `pointer` dropped here while still borrowed
-LL | //~^^ ERROR `pointer` does not live long enough
-LL | println!("{}", dangling);
- | -------- borrow later used here
error: aborting due to previous error
error[E0597]: `x` does not live long enough
--> $DIR/unboxed-closure-region.rs:18:12
|
+LL | let _f = {
+ | -- borrow later stored here
+LL | let x = 0;
LL | || x //~ ERROR `x` does not live long enough
| -- ^ borrowed value does not live long enough
| |
| value captured here
LL | };
| - `x` dropped here while still borrowed
-LL | _f;
- | -- borrow later used here
error: aborting due to previous error