Also use smaller spans for unsize adjustments

rust-lang · Aug 27, 2018 · 7f7fada · 7f7fada
1 parent 9309e2e
commit 7f7fada
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Showing 8 changed files with 62 additions and 89 deletions.
diff --git a/src/librustc_mir/hair/cx/expr.rs b/src/librustc_mir/hair/cx/expr.rs
@@ -199,6 +199,13 @@ fn apply_adjustment<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
             ExprKind::Use { source: cast_expr.to_ref() }
         }
         Adjust::Unsize => {
+            // See the above comment for Adjust::Deref
+            if let ExprKind::Block { body } = expr.kind {
+                if let Some(ref last_expr) = body.expr {
+                    span = last_expr.span;
+                    expr.span = span;
+                }
+            }
             ExprKind::Unsize { source: expr.to_ref() }
         }
     };

diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.nll.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.nll.stderr
@@ -11,18 +11,13 @@ LL |     ss.r = b; //~ ERROR 41:12: 41:13: explicit lifetime required in the typ
    |            ^
 
 error[E0621]: explicit lifetime required in the type of `ss`
-  --> $DIR/object-lifetime-default-from-box-error.rs:24:48
+  --> $DIR/object-lifetime-default-from-box-error.rs:28:5
    |
-LL |   fn load(ss: &mut SomeStruct) -> Box<SomeTrait> {
-   |  _____________---------------____________________^
-   | |             |
-   | |             help: add explicit lifetime `'static` to the type of `ss`: `&mut SomeStruct<'static>`
-LL | |     // `Box<SomeTrait>` defaults to a `'static` bound, so this return
-LL | |     // is illegal.
-LL | |
-LL | |     ss.r //~ ERROR explicit lifetime required in the type of `ss` [E0621]
-LL | | }
-   | |_^ lifetime `'static` required
+LL | fn load(ss: &mut SomeStruct) -> Box<SomeTrait> {
+   |             --------------- help: add explicit lifetime `'static` to the type of `ss`: `&mut SomeStruct<'static>`
+...
+LL |     ss.r //~ ERROR explicit lifetime required in the type of `ss` [E0621]
+   |     ^^^^ lifetime `'static` required
 
 error[E0507]: cannot move out of borrowed content
   --> $DIR/object-lifetime-default-from-box-error.rs:28:5

diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr
@@ -31,43 +31,31 @@ LL |     let x: Box<Foo + 'static> = Box::new(v);
    |                                 ^^^^^^^^^^^ lifetime `'static` required
 
 error[E0621]: explicit lifetime required in the type of `v`
-  --> $DIR/region-object-lifetime-in-coercion.rs:23:38
+  --> $DIR/region-object-lifetime-in-coercion.rs:24:5
    |
-LL |   fn b(v: &[u8]) -> Box<Foo + 'static> {
-   |  _________-----________________________^
-   | |         |
-   | |         help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
-LL | |     Box::new(v)
-LL | |         //~^ ERROR explicit lifetime required in the type of `v` [E0621]
-LL | | }
-   | |_^ lifetime `'static` required
+LL | fn b(v: &[u8]) -> Box<Foo + 'static> {
+   |         ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
+LL |     Box::new(v)
+   |     ^^^^^^^^^^^ lifetime `'static` required
 
 error[E0621]: explicit lifetime required in the type of `v`
-  --> $DIR/region-object-lifetime-in-coercion.rs:28:28
+  --> $DIR/region-object-lifetime-in-coercion.rs:31:5
    |
-LL |   fn c(v: &[u8]) -> Box<Foo> {
-   |  _________-----______________^
-   | |         |
-   | |         help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
-LL | |     // same as previous case due to RFC 599
-LL | |
-LL | |     Box::new(v)
-LL | |         //~^ ERROR explicit lifetime required in the type of `v` [E0621]
-LL | | }
-   | |_^ lifetime `'static` required
+LL | fn c(v: &[u8]) -> Box<Foo> {
+   |         ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
+...
+LL |     Box::new(v)
+   |     ^^^^^^^^^^^ lifetime `'static` required
 
 error: unsatisfied lifetime constraints
-  --> $DIR/region-object-lifetime-in-coercion.rs:35:41
+  --> $DIR/region-object-lifetime-in-coercion.rs:36:5
    |
-LL |   fn d<'a,'b>(v: &'a [u8]) -> Box<Foo+'b> {
-   |  ______--_--______________________________^
-   | |      |  |
-   | |      |  lifetime `'b` defined here
-   | |      lifetime `'a` defined here
-LL | |     Box::new(v)
-LL | |         //~^ ERROR cannot infer an appropriate lifetime due to conflicting
-LL | | }
-   | |_^ returning this value requires that `'a` must outlive `'b`
+LL | fn d<'a,'b>(v: &'a [u8]) -> Box<Foo+'b> {
+   |      -- -- lifetime `'b` defined here
+   |      |
+   |      lifetime `'a` defined here
+LL |     Box::new(v)
+   |     ^^^^^^^^^^^ returning this value requires that `'a` must outlive `'b`
 
 error: aborting due to 4 previous errors
 

diff --git a/src/test/ui/regions/regions-close-object-into-object-2.nll.stderr b/src/test/ui/regions/regions-close-object-into-object-2.nll.stderr
@@ -5,15 +5,12 @@ LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
    |           ^^^
 
 error: unsatisfied lifetime constraints
-  --> $DIR/regions-close-object-into-object-2.rs:19:57
+  --> $DIR/regions-close-object-into-object-2.rs:20:5
    |
-LL |   fn g<'a, T: 'static>(v: Box<A<T>+'a>) -> Box<X+'static> {
-   |  ______--_________________________________________________^
-   | |      |
-   | |      lifetime `'a` defined here
-LL | |     box B(&*v) as Box<X> //~ ERROR cannot infer
-LL | | }
-   | |_^ returning this value requires that `'a` must outlive `'static`
+LL | fn g<'a, T: 'static>(v: Box<A<T>+'a>) -> Box<X+'static> {
+   |      -- lifetime `'a` defined here
+LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
+   |     ^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
 
 error[E0597]: `*v` does not live long enough
   --> $DIR/regions-close-object-into-object-2.rs:20:11

diff --git a/src/test/ui/regions/regions-close-object-into-object-4.nll.stderr b/src/test/ui/regions/regions-close-object-into-object-4.nll.stderr
@@ -28,17 +28,6 @@ warning: not reporting region error due to nll
 LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
    |     ^^^^^^^^^^
 
-error: unsatisfied lifetime constraints
-  --> $DIR/regions-close-object-into-object-4.rs:19:51
-   |
-LL |   fn i<'a, T, U>(v: Box<A<U>+'a>) -> Box<X+'static> {
-   |  ______--___________________________________________^
-   | |      |
-   | |      lifetime `'a` defined here
-LL | |     box B(&*v) as Box<X> //~ ERROR cannot infer
-LL | | }
-   | |_^ returning this value requires that `'a` must outlive `'static`
-
 error[E0310]: the parameter type `U` may not live long enough
   --> $DIR/regions-close-object-into-object-4.rs:20:5
    |
@@ -47,6 +36,14 @@ LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
    |
    = help: consider adding an explicit lifetime bound `U: 'static`...
 
+error: unsatisfied lifetime constraints
+  --> $DIR/regions-close-object-into-object-4.rs:20:5
+   |
+LL | fn i<'a, T, U>(v: Box<A<U>+'a>) -> Box<X+'static> {
+   |      -- lifetime `'a` defined here
+LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
+   |     ^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
+
 error[E0310]: the parameter type `U` may not live long enough
   --> $DIR/regions-close-object-into-object-4.rs:20:9
    |

diff --git a/src/test/ui/regions/regions-proc-bound-capture.nll.stderr b/src/test/ui/regions/regions-proc-bound-capture.nll.stderr
@@ -5,16 +5,13 @@ LL |     Box::new(move|| { *x }) //~ ERROR explicit lifetime required in the typ
    |              ^^^^^^^^^^^^^
 
 error[E0621]: explicit lifetime required in the type of `x`
-  --> $DIR/regions-proc-bound-capture.rs:17:62
+  --> $DIR/regions-proc-bound-capture.rs:19:5
    |
-LL |   fn static_proc(x: &isize) -> Box<FnMut()->(isize) + 'static> {
-   |  ___________________------_____________________________________^
-   | |                   |
-   | |                   help: add explicit lifetime `'static` to the type of `x`: `&'static isize`
-LL | |     // This is illegal, because the region bound on `proc` is 'static.
-LL | |     Box::new(move|| { *x }) //~ ERROR explicit lifetime required in the type of `x` [E0621]
-LL | | }
-   | |_^ lifetime `'static` required
+LL | fn static_proc(x: &isize) -> Box<FnMut()->(isize) + 'static> {
+   |                   ------ help: add explicit lifetime `'static` to the type of `x`: `&'static isize`
+LL |     // This is illegal, because the region bound on `proc` is 'static.
+LL |     Box::new(move|| { *x }) //~ ERROR explicit lifetime required in the type of `x` [E0621]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^ lifetime `'static` required
 
 error: aborting due to previous error
 

diff --git a/src/test/ui/span/regions-close-over-type-parameter-2.nll.stderr b/src/test/ui/span/regions-close-over-type-parameter-2.nll.stderr
@@ -1,17 +1,12 @@
 error[E0597]: `tmp0` does not live long enough
   --> $DIR/regions-close-over-type-parameter-2.rs:33:20
    |
-LL |       let _ = {
-   |  _____________-
-LL | |         let tmp0 = 3;
-LL | |         let tmp1 = &tmp0;
-   | |                    ^^^^^ borrowed value does not live long enough
-LL | |         repeater3(tmp1)
-LL | |     };
-   | |     -
-   | |     |
-   | |_____`tmp0` dropped here while still borrowed
-   |       borrow later used here
+LL |         let tmp1 = &tmp0;
+   |                    ^^^^^ borrowed value does not live long enough
+LL |         repeater3(tmp1)
+   |         --------------- borrow later used here
+LL |     };
+   |     - `tmp0` dropped here while still borrowed
 
 error: aborting due to previous error
 

diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.nll.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.nll.stderr
@@ -23,16 +23,13 @@ LL |     Box::new(items.iter()) //~ ERROR cannot infer an appropriate lifetime
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
 error: unsatisfied lifetime constraints
-  --> $DIR/dyn-trait-underscore.rs:16:52
+  --> $DIR/dyn-trait-underscore.rs:18:5
    |
-LL |   fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
-   |  ________________-___________________________________^
-   | |                |
-   | |                let's call the lifetime of this reference `'1`
-LL | |     //                      ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
-LL | |     Box::new(items.iter()) //~ ERROR cannot infer an appropriate lifetime
-LL | | }
-   | |_^ returning this value requires that `'1` must outlive `'static`
+LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
+   |                - let's call the lifetime of this reference `'1`
+LL |     //                      ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
+LL |     Box::new(items.iter()) //~ ERROR cannot infer an appropriate lifetime
+   |     ^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static`
 
 error: aborting due to previous error