"closure"
};
- let desc_place = self.describe_place(place).unwrap_or_else(|| "_".to_owned());
- let tcx = self.infcx.tcx;
-
- let first_borrow_desc;
+ let (desc_place, msg_place, msg_borrow) = if issued_borrow.borrowed_place == *place {
+ let desc_place = self.describe_place(place).unwrap_or_else(|| "_".to_owned());
+ (desc_place, "".to_string(), "".to_string())
+ } else {
+ let (desc_place, msg_place) = self.describe_place_for_conflicting_borrow(place);
+ let (_, msg_borrow) = self.describe_place_for_conflicting_borrow(
+ &issued_borrow.borrowed_place
+ );
+ (desc_place, msg_place, msg_borrow)
+ };
let explanation = self.explain_why_borrow_contains_point(context, issued_borrow, None);
let second_borrow_desc = if explanation.is_explained() {
};
// FIXME: supply non-"" `opt_via` when appropriate
+ let tcx = self.infcx.tcx;
+ let first_borrow_desc;
let mut err = match (
gen_borrow_kind,
"immutable",
tcx.cannot_reborrow_already_borrowed(
span,
&desc_place,
- "",
+ &msg_place,
lft,
issued_span,
"it",
rgt,
- "",
+ &msg_borrow,
None,
Origin::Mir,
)
tcx.cannot_reborrow_already_borrowed(
span,
&desc_place,
- "",
+ &msg_place,
lft,
issued_span,
"it",
rgt,
- "",
+ &msg_borrow,
None,
Origin::Mir,
)
tcx.cannot_mutably_borrow_multiply(
span,
&desc_place,
- "",
+ &msg_place,
issued_span,
- "",
+ &msg_borrow,
None,
Origin::Mir,
)
err.buffer(&mut self.errors_buffer);
}
+ /// Returns a description of a place and an associated message for the purposes of conflicting
+ /// borrow diagnostics.
+ ///
+ /// If the borrow is of the field `b` of a union `u`, then the return value will be
+ /// `("u", " (via \`u.b\`)")`. Otherwise, for some variable `a`, the return value will be
+ /// `("a", "")`.
+ pub(super) fn describe_place_for_conflicting_borrow(
+ &self,
+ place: &Place<'tcx>,
+ ) -> (String, String) {
+ place.base_local()
+ .filter(|local| {
+ // Filter out non-unions.
+ self.mir.local_decls[*local].ty
+ .ty_adt_def()
+ .map(|adt| adt.is_union())
+ .unwrap_or(false)
+ })
+ .and_then(|local| {
+ let desc_base = self.describe_place(&Place::Local(local))
+ .unwrap_or_else(|| "_".to_owned());
+ let desc_original = self.describe_place(place)
+ .unwrap_or_else(|| "_".to_owned());
+ return Some((desc_base, format!(" (via `{}`)", desc_original)));
+ })
+ .unwrap_or_else(|| {
+ (self.describe_place(place).unwrap_or_else(|| "_".to_owned()), "".to_string())
+ })
+ }
+
/// Reports StorageDeadOrDrop of `place` conflicts with `borrow`.
///
/// This means that some data referenced by `borrow` needs to live
+++ /dev/null
-error[E0502]: cannot borrow `u.a` as mutable because it is also borrowed as immutable
- --> $DIR/borrowck-union-borrow.rs:27:23
- |
-LL | let ra = &u.a;
- | ---- immutable borrow occurs here
-LL | let rma = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
- | ^^^^^^^^ mutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
-LL | drop(ra);
- | -- immutable borrow later used here
-
-error[E0506]: cannot assign to `u.a` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:33:13
- |
-LL | let ra = &u.a;
- | ---- borrow of `u.a` occurs here
-LL | u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.a` occurs here
-LL | //[mir]~^ ERROR cannot assign to `u.a` because it is borrowed
-LL | drop(ra);
- | -- borrow later used here
-
-error[E0502]: cannot borrow `u.b` as mutable because it is also borrowed as immutable
- --> $DIR/borrowck-union-borrow.rs:50:23
- |
-LL | let ra = &u.a;
- | ---- immutable borrow occurs here
-LL | let rmb = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
- | ^^^^^^^^ mutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.b` as mutable because it is also borrowed as immutable
-LL | drop(ra);
- | -- immutable borrow later used here
-
-error[E0506]: cannot assign to `u.b` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:56:13
- |
-LL | let ra = &u.a;
- | ---- borrow of `u.b` occurs here
-LL | u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.b` occurs here
-LL | //[mir]~^ ERROR cannot assign to `u.b` because it is borrowed
-LL | drop(ra);
- | -- borrow later used here
-
-error[E0502]: cannot borrow `u.a` as immutable because it is also borrowed as mutable
- --> $DIR/borrowck-union-borrow.rs:63:22
- |
-LL | let rma = &mut u.a;
- | -------- mutable borrow occurs here
-LL | let ra = &u.a; //[ast]~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
- | ^^^^ immutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
-LL | drop(rma);
- | --- mutable borrow later used here
-
-error[E0503]: cannot use `u.a` because it was mutably borrowed
- --> $DIR/borrowck-union-borrow.rs:69:21
- |
-LL | let ra = &mut u.a;
- | -------- borrow of `u.a` occurs here
-LL | let a = u.a; //[ast]~ ERROR cannot use `u.a` because it was mutably borrowed
- | ^^^ use of borrowed `u.a`
-LL | //[mir]~^ ERROR cannot use `u.a` because it was mutably borrowed
-LL | drop(ra);
- | -- borrow later used here
-
-error[E0499]: cannot borrow `u.a` as mutable more than once at a time
- --> $DIR/borrowck-union-borrow.rs:75:24
- |
-LL | let rma = &mut u.a;
- | -------- first mutable borrow occurs here
-LL | let rma2 = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable more than once at a time
- | ^^^^^^^^ second mutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.a` as mutable more than once at a time
-LL | drop(rma);
- | --- first borrow later used here
-
-error[E0506]: cannot assign to `u.a` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:81:13
- |
-LL | let rma = &mut u.a;
- | -------- borrow of `u.a` occurs here
-LL | u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.a` occurs here
-LL | //[mir]~^ ERROR cannot assign to `u.a` because it is borrowed
-LL | drop(rma);
- | --- borrow later used here
-
-error[E0502]: cannot borrow `u.b` as immutable because it is also borrowed as mutable
- --> $DIR/borrowck-union-borrow.rs:88:22
- |
-LL | let rma = &mut u.a;
- | -------- mutable borrow occurs here
-LL | let rb = &u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
- | ^^^^ immutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.b` as immutable because it is also borrowed as mutable
-LL | drop(rma);
- | --- mutable borrow later used here
-
-error[E0503]: cannot use `u.b` because it was mutably borrowed
- --> $DIR/borrowck-union-borrow.rs:94:21
- |
-LL | let ra = &mut u.a;
- | -------- borrow of `u.a` occurs here
-LL | let b = u.b; //[ast]~ ERROR cannot use `u.b` because it was mutably borrowed
- | ^^^ use of borrowed `u.a`
-...
-LL | drop(ra);
- | -- borrow later used here
-
-error[E0499]: cannot borrow `u.b` as mutable more than once at a time
- --> $DIR/borrowck-union-borrow.rs:101:24
- |
-LL | let rma = &mut u.a;
- | -------- first mutable borrow occurs here
-LL | let rmb2 = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
- | ^^^^^^^^ second mutable borrow occurs here
-LL | //[mir]~^ ERROR cannot borrow `u.b` as mutable more than once at a time
-LL | drop(rma);
- | --- first borrow later used here
-
-error[E0506]: cannot assign to `u.b` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:107:13
- |
-LL | let rma = &mut u.a;
- | -------- borrow of `u.b` occurs here
-LL | u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.b` occurs here
-LL | //[mir]~^ ERROR cannot assign to `u.b` because it is borrowed
-LL | drop(rma);
- | --- borrow later used here
-
-error: aborting due to 12 previous errors
-
-Some errors occurred: E0499, E0502, E0503, E0506.
-For more information about an error, try `rustc --explain E0499`.
+++ /dev/null
-error[E0502]: cannot borrow `u.a` as mutable because it is also borrowed as immutable
- --> $DIR/borrowck-union-borrow.rs:27:28
- |
-LL | let ra = &u.a;
- | --- immutable borrow occurs here
-LL | let rma = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
- | ^^^ mutable borrow occurs here
-...
-LL | }
- | - immutable borrow ends here
-
-error[E0506]: cannot assign to `u.a` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:33:13
- |
-LL | let ra = &u.a;
- | --- borrow of `u.a` occurs here
-LL | u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.a` occurs here
-
-error[E0502]: cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
- --> $DIR/borrowck-union-borrow.rs:50:28
- |
-LL | let ra = &u.a;
- | --- immutable borrow occurs here (via `u.a`)
-LL | let rmb = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
- | ^^^ mutable borrow occurs here (via `u.b`)
-...
-LL | }
- | - immutable borrow ends here
-
-error[E0506]: cannot assign to `u.b` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:56:13
- |
-LL | let ra = &u.a;
- | --- borrow of `u.b` occurs here
-LL | u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.b` occurs here
-
-error[E0502]: cannot borrow `u.a` as immutable because it is also borrowed as mutable
- --> $DIR/borrowck-union-borrow.rs:63:23
- |
-LL | let rma = &mut u.a;
- | --- mutable borrow occurs here
-LL | let ra = &u.a; //[ast]~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
- | ^^^ immutable borrow occurs here
-...
-LL | }
- | - mutable borrow ends here
-
-error[E0503]: cannot use `u.a` because it was mutably borrowed
- --> $DIR/borrowck-union-borrow.rs:69:17
- |
-LL | let ra = &mut u.a;
- | --- borrow of `u.a` occurs here
-LL | let a = u.a; //[ast]~ ERROR cannot use `u.a` because it was mutably borrowed
- | ^ use of borrowed `u.a`
-
-error[E0499]: cannot borrow `u.a` as mutable more than once at a time
- --> $DIR/borrowck-union-borrow.rs:75:29
- |
-LL | let rma = &mut u.a;
- | --- first mutable borrow occurs here
-LL | let rma2 = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable more than once at a time
- | ^^^ second mutable borrow occurs here
-...
-LL | }
- | - first borrow ends here
-
-error[E0506]: cannot assign to `u.a` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:81:13
- |
-LL | let rma = &mut u.a;
- | --- borrow of `u.a` occurs here
-LL | u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.a` occurs here
-
-error[E0502]: cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
- --> $DIR/borrowck-union-borrow.rs:88:23
- |
-LL | let rma = &mut u.a;
- | --- mutable borrow occurs here (via `u.a`)
-LL | let rb = &u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
- | ^^^ immutable borrow occurs here (via `u.b`)
-...
-LL | }
- | - mutable borrow ends here
-
-error[E0503]: cannot use `u.b` because it was mutably borrowed
- --> $DIR/borrowck-union-borrow.rs:94:17
- |
-LL | let ra = &mut u.a;
- | --- borrow of `u.a` occurs here
-LL | let b = u.b; //[ast]~ ERROR cannot use `u.b` because it was mutably borrowed
- | ^ use of borrowed `u.a`
-
-error[E0499]: cannot borrow `u` (via `u.b`) as mutable more than once at a time
- --> $DIR/borrowck-union-borrow.rs:101:29
- |
-LL | let rma = &mut u.a;
- | --- first mutable borrow occurs here (via `u.a`)
-LL | let rmb2 = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
- | ^^^ second mutable borrow occurs here (via `u.b`)
-...
-LL | }
- | - first borrow ends here
-
-error[E0506]: cannot assign to `u.b` because it is borrowed
- --> $DIR/borrowck-union-borrow.rs:107:13
- |
-LL | let rma = &mut u.a;
- | --- borrow of `u.b` occurs here
-LL | u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- | ^^^^^^^ assignment to borrowed `u.b` occurs here
-
-error: aborting due to 12 previous errors
-
-Some errors occurred: E0499, E0502, E0503, E0506.
-For more information about an error, try `rustc --explain E0499`.
--- /dev/null
+error[E0502]: cannot borrow `u.a` as mutable because it is also borrowed as immutable
+ --> $DIR/borrowck-union-borrow.rs:25:23
+ |
+LL | let ra = &u.a;
+ | ---- immutable borrow occurs here
+LL | let rma = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
+ | ^^^^^^^^ mutable borrow occurs here
+LL | drop(ra);
+ | -- immutable borrow later used here
+
+error[E0506]: cannot assign to `u.a` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:30:13
+ |
+LL | let ra = &u.a;
+ | ---- borrow of `u.a` occurs here
+LL | u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.a` occurs here
+LL | drop(ra);
+ | -- borrow later used here
+
+error[E0502]: cannot borrow `u` (via `u.b`) as mutable because it is also borrowed as immutable (via `u.a`)
+ --> $DIR/borrowck-union-borrow.rs:46:23
+ |
+LL | let ra = &u.a;
+ | ---- immutable borrow occurs here (via `u.a`)
+LL | let rmb = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
+ | ^^^^^^^^ mutable borrow occurs here (via `u.b`)
+LL | drop(ra);
+ | -- immutable borrow later used here
+
+error[E0506]: cannot assign to `u.b` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:51:13
+ |
+LL | let ra = &u.a;
+ | ---- borrow of `u.b` occurs here
+LL | u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.b` occurs here
+LL | drop(ra);
+ | -- borrow later used here
+
+error[E0502]: cannot borrow `u.a` as immutable because it is also borrowed as mutable
+ --> $DIR/borrowck-union-borrow.rs:57:22
+ |
+LL | let rma = &mut u.a;
+ | -------- mutable borrow occurs here
+LL | let ra = &u.a; //~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
+ | ^^^^ immutable borrow occurs here
+LL | drop(rma);
+ | --- mutable borrow later used here
+
+error[E0503]: cannot use `u.a` because it was mutably borrowed
+ --> $DIR/borrowck-union-borrow.rs:62:21
+ |
+LL | let ra = &mut u.a;
+ | -------- borrow of `u.a` occurs here
+LL | let a = u.a; //~ ERROR cannot use `u.a` because it was mutably borrowed
+ | ^^^ use of borrowed `u.a`
+LL | drop(ra);
+ | -- borrow later used here
+
+error[E0499]: cannot borrow `u.a` as mutable more than once at a time
+ --> $DIR/borrowck-union-borrow.rs:67:24
+ |
+LL | let rma = &mut u.a;
+ | -------- first mutable borrow occurs here
+LL | let rma2 = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable more than once at a time
+ | ^^^^^^^^ second mutable borrow occurs here
+LL | drop(rma);
+ | --- first borrow later used here
+
+error[E0506]: cannot assign to `u.a` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:72:13
+ |
+LL | let rma = &mut u.a;
+ | -------- borrow of `u.a` occurs here
+LL | u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.a` occurs here
+LL | drop(rma);
+ | --- borrow later used here
+
+error[E0502]: cannot borrow `u` (via `u.b`) as immutable because it is also borrowed as mutable (via `u.a`)
+ --> $DIR/borrowck-union-borrow.rs:78:22
+ |
+LL | let rma = &mut u.a;
+ | -------- mutable borrow occurs here (via `u.a`)
+LL | let rb = &u.b; //~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
+ | ^^^^ immutable borrow occurs here (via `u.b`)
+LL | drop(rma);
+ | --- mutable borrow later used here
+
+error[E0503]: cannot use `u.b` because it was mutably borrowed
+ --> $DIR/borrowck-union-borrow.rs:83:21
+ |
+LL | let ra = &mut u.a;
+ | -------- borrow of `u.a` occurs here
+LL | let b = u.b; //~ ERROR cannot use `u.b` because it was mutably borrowed
+ | ^^^ use of borrowed `u.a`
+LL |
+LL | drop(ra);
+ | -- borrow later used here
+
+error[E0499]: cannot borrow `u` (via `u.b`) as mutable more than once at a time
+ --> $DIR/borrowck-union-borrow.rs:89:24
+ |
+LL | let rma = &mut u.a;
+ | -------- first mutable borrow occurs here (via `u.a`)
+LL | let rmb2 = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
+ | ^^^^^^^^ second mutable borrow occurs here (via `u.b`)
+LL | drop(rma);
+ | --- first borrow later used here
+
+error[E0506]: cannot assign to `u.b` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:94:13
+ |
+LL | let rma = &mut u.a;
+ | -------- borrow of `u.b` occurs here
+LL | u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.b` occurs here
+LL | drop(rma);
+ | --- borrow later used here
+
+error: aborting due to 12 previous errors
+
+Some errors occurred: E0499, E0502, E0503, E0506.
+For more information about an error, try `rustc --explain E0499`.
// ignore-tidy-linelength
-// revisions: ast mir
-//[mir]compile-flags: -Z borrowck=mir
#[derive(Clone, Copy)]
union U {
}
{
let ra = &u.a;
- let rma = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
- //[mir]~^ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
+ let rma = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
drop(ra);
}
{
let ra = &u.a;
- u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- //[mir]~^ ERROR cannot assign to `u.a` because it is borrowed
+ u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
drop(ra);
}
// Imm borrow, other field
}
{
let ra = &u.a;
- let rmb = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
- //[mir]~^ ERROR cannot borrow `u.b` as mutable because it is also borrowed as immutable
+ let rmb = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
drop(ra);
}
{
let ra = &u.a;
- u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- //[mir]~^ ERROR cannot assign to `u.b` because it is borrowed
+ u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
drop(ra);
}
// Mut borrow, same field
{
let rma = &mut u.a;
- let ra = &u.a; //[ast]~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
- //[mir]~^ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
+ let ra = &u.a; //~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
drop(rma);
}
{
let ra = &mut u.a;
- let a = u.a; //[ast]~ ERROR cannot use `u.a` because it was mutably borrowed
- //[mir]~^ ERROR cannot use `u.a` because it was mutably borrowed
+ let a = u.a; //~ ERROR cannot use `u.a` because it was mutably borrowed
drop(ra);
}
{
let rma = &mut u.a;
- let rma2 = &mut u.a; //[ast]~ ERROR cannot borrow `u.a` as mutable more than once at a time
- //[mir]~^ ERROR cannot borrow `u.a` as mutable more than once at a time
+ let rma2 = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable more than once at a time
drop(rma);
}
{
let rma = &mut u.a;
- u.a = 1; //[ast]~ ERROR cannot assign to `u.a` because it is borrowed
- //[mir]~^ ERROR cannot assign to `u.a` because it is borrowed
+ u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
drop(rma);
}
// Mut borrow, other field
{
let rma = &mut u.a;
- let rb = &u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
- //[mir]~^ ERROR cannot borrow `u.b` as immutable because it is also borrowed as mutable
+ let rb = &u.b; //~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
drop(rma);
}
{
let ra = &mut u.a;
- let b = u.b; //[ast]~ ERROR cannot use `u.b` because it was mutably borrowed
- //[mir]~^ ERROR cannot use `u.b` because it was mutably borrowed
+ let b = u.b; //~ ERROR cannot use `u.b` because it was mutably borrowed
drop(ra);
}
{
let rma = &mut u.a;
- let rmb2 = &mut u.b; //[ast]~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
- //[mir]~^ ERROR cannot borrow `u.b` as mutable more than once at a time
+ let rmb2 = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
drop(rma);
}
{
let rma = &mut u.a;
- u.b = 1; //[ast]~ ERROR cannot assign to `u.b` because it is borrowed
- //[mir]~^ ERROR cannot assign to `u.b` because it is borrowed
+ u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
drop(rma);
}
}
--- /dev/null
+error[E0502]: cannot borrow `u.a` as mutable because it is also borrowed as immutable
+ --> $DIR/borrowck-union-borrow.rs:25:28
+ |
+LL | let ra = &u.a;
+ | --- immutable borrow occurs here
+LL | let rma = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable
+ | ^^^ mutable borrow occurs here
+LL | drop(ra);
+LL | }
+ | - immutable borrow ends here
+
+error[E0506]: cannot assign to `u.a` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:30:13
+ |
+LL | let ra = &u.a;
+ | --- borrow of `u.a` occurs here
+LL | u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.a` occurs here
+
+error[E0502]: cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
+ --> $DIR/borrowck-union-borrow.rs:46:28
+ |
+LL | let ra = &u.a;
+ | --- immutable borrow occurs here (via `u.a`)
+LL | let rmb = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable because `u` is also borrowed as immutable (via `u.a`)
+ | ^^^ mutable borrow occurs here (via `u.b`)
+LL | drop(ra);
+LL | }
+ | - immutable borrow ends here
+
+error[E0506]: cannot assign to `u.b` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:51:13
+ |
+LL | let ra = &u.a;
+ | --- borrow of `u.b` occurs here
+LL | u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.b` occurs here
+
+error[E0502]: cannot borrow `u.a` as immutable because it is also borrowed as mutable
+ --> $DIR/borrowck-union-borrow.rs:57:23
+ |
+LL | let rma = &mut u.a;
+ | --- mutable borrow occurs here
+LL | let ra = &u.a; //~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable
+ | ^^^ immutable borrow occurs here
+LL | drop(rma);
+LL | }
+ | - mutable borrow ends here
+
+error[E0503]: cannot use `u.a` because it was mutably borrowed
+ --> $DIR/borrowck-union-borrow.rs:62:17
+ |
+LL | let ra = &mut u.a;
+ | --- borrow of `u.a` occurs here
+LL | let a = u.a; //~ ERROR cannot use `u.a` because it was mutably borrowed
+ | ^ use of borrowed `u.a`
+
+error[E0499]: cannot borrow `u.a` as mutable more than once at a time
+ --> $DIR/borrowck-union-borrow.rs:67:29
+ |
+LL | let rma = &mut u.a;
+ | --- first mutable borrow occurs here
+LL | let rma2 = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable more than once at a time
+ | ^^^ second mutable borrow occurs here
+LL | drop(rma);
+LL | }
+ | - first borrow ends here
+
+error[E0506]: cannot assign to `u.a` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:72:13
+ |
+LL | let rma = &mut u.a;
+ | --- borrow of `u.a` occurs here
+LL | u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.a` occurs here
+
+error[E0502]: cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
+ --> $DIR/borrowck-union-borrow.rs:78:23
+ |
+LL | let rma = &mut u.a;
+ | --- mutable borrow occurs here (via `u.a`)
+LL | let rb = &u.b; //~ ERROR cannot borrow `u` (via `u.b`) as immutable because `u` is also borrowed as mutable (via `u.a`)
+ | ^^^ immutable borrow occurs here (via `u.b`)
+LL | drop(rma);
+LL | }
+ | - mutable borrow ends here
+
+error[E0503]: cannot use `u.b` because it was mutably borrowed
+ --> $DIR/borrowck-union-borrow.rs:83:17
+ |
+LL | let ra = &mut u.a;
+ | --- borrow of `u.a` occurs here
+LL | let b = u.b; //~ ERROR cannot use `u.b` because it was mutably borrowed
+ | ^ use of borrowed `u.a`
+
+error[E0499]: cannot borrow `u` (via `u.b`) as mutable more than once at a time
+ --> $DIR/borrowck-union-borrow.rs:89:29
+ |
+LL | let rma = &mut u.a;
+ | --- first mutable borrow occurs here (via `u.a`)
+LL | let rmb2 = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time
+ | ^^^ second mutable borrow occurs here (via `u.b`)
+LL | drop(rma);
+LL | }
+ | - first borrow ends here
+
+error[E0506]: cannot assign to `u.b` because it is borrowed
+ --> $DIR/borrowck-union-borrow.rs:94:13
+ |
+LL | let rma = &mut u.a;
+ | --- borrow of `u.b` occurs here
+LL | u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed
+ | ^^^^^^^ assignment to borrowed `u.b` occurs here
+
+error: aborting due to 12 previous errors
+
+Some errors occurred: E0499, E0502, E0503, E0506.
+For more information about an error, try `rustc --explain E0499`.
#![allow(unused)]
#![feature(nll)]
+// ignore-tidy-linelength
+
#[derive(Clone, Copy, Default)]
struct S {
a: u8,
*mref = 22;
let nref = &u.z.c;
- //~^ ERROR cannot borrow `u.z.c` as immutable because it is also borrowed as mutable [E0502]
+ //~^ ERROR cannot borrow `u` (via `u.z.c`) as immutable because it is also borrowed as mutable (via `u.s.a`) [E0502]
println!("{} {}", mref, nref)
}
}
-
-error[E0502]: cannot borrow `u.z.c` as immutable because it is also borrowed as mutable
- --> $DIR/issue-45157.rs:27:20
+error[E0502]: cannot borrow `u` (via `u.z.c`) as immutable because it is also borrowed as mutable (via `u.s.a`)
+ --> $DIR/issue-45157.rs:29:20
|
LL | let mref = &mut u.s.a;
- | ---------- mutable borrow occurs here
+ | ---------- mutable borrow occurs here (via `u.s.a`)
...
LL | let nref = &u.z.c;
- | ^^^^^^ immutable borrow occurs here
-LL | //~^ ERROR cannot borrow `u.z.c` as immutable because it is also borrowed as mutable [E0502]
+ | ^^^^^^ immutable borrow occurs here (via `u.z.c`)
+LL | //~^ ERROR cannot borrow `u` (via `u.z.c`) as immutable because it is also borrowed as mutable (via `u.s.a`) [E0502]
LL | println!("{} {}", mref, nref)
| ---- mutable borrow later used here
-error[E0502]: cannot borrow `u.y` as immutable because it is also borrowed as mutable
+error[E0502]: cannot borrow `u` (via `u.y`) as immutable because it is also borrowed as mutable (via `u.x.0`)
--> $DIR/union-borrow-move-parent-sibling.rs:15:13
|
LL | let a = &mut u.x.0;
- | ---------- mutable borrow occurs here
+ | ---------- mutable borrow occurs here (via `u.x.0`)
LL | let b = &u.y; //~ ERROR cannot borrow `u.y`
- | ^^^^ immutable borrow occurs here
+ | ^^^^ immutable borrow occurs here (via `u.y`)
LL | use_borrow(a);
| - mutable borrow later used here
|
= note: move occurs because `u` has type `U`, which does not implement the `Copy` trait
-error[E0502]: cannot borrow `u.y` as immutable because it is also borrowed as mutable
+error[E0502]: cannot borrow `u` (via `u.y`) as immutable because it is also borrowed as mutable (via `u.x.0.0`)
--> $DIR/union-borrow-move-parent-sibling.rs:28:13
|
LL | let a = &mut (u.x.0).0;
- | -------------- mutable borrow occurs here
+ | -------------- mutable borrow occurs here (via `u.x.0.0`)
LL | let b = &u.y; //~ ERROR cannot borrow `u.y`
- | ^^^^ immutable borrow occurs here
+ | ^^^^ immutable borrow occurs here (via `u.y`)
LL | use_borrow(a);
| - mutable borrow later used here
|
= note: move occurs because `u` has type `U`, which does not implement the `Copy` trait
-error[E0502]: cannot borrow `u.x` as immutable because it is also borrowed as mutable
+error[E0502]: cannot borrow `u` (via `u.x`) as immutable because it is also borrowed as mutable (via `*u.y`)
--> $DIR/union-borrow-move-parent-sibling.rs:41:13
|
LL | let a = &mut *u.y;
- | --------- mutable borrow occurs here
+ | --------- mutable borrow occurs here (via `*u.y`)
LL | let b = &u.x; //~ ERROR cannot borrow `u` (via `u.x`)
- | ^^^^ immutable borrow occurs here
+ | ^^^^ immutable borrow occurs here (via `u.x`)
LL | use_borrow(a);
| - mutable borrow later used here
projects / rust.git / commitdiff