Point to lifetime in fn definition on lifetime error note

src/librustc/infer/error_reporting/mod.rs

@@ -189,6 +189,8 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         self,
         region: ty::Region<'tcx>,
     ) -> (String, Option<Span>) {
+        let cm = self.sess.codemap();
+
         let scope = region.free_region_binding_scope(self);
         let node = self.hir.as_local_node_id(scope).unwrap_or(DUMMY_NODE_ID);
         let unknown;
@@ -219,10 +221,17 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             }
         };
         let (prefix, span) = match *region {
-            ty::ReEarlyBound(ref br) => (
-                format!("the lifetime {} as defined on", br.name),
-                self.sess.codemap().def_span(self.hir.span(node)),
-            ),
+            ty::ReEarlyBound(ref br) => {
+                let mut sp = cm.def_span(self.hir.span(node));
+                if let Some(generics) = self.hir.get_generics(scope) {
+                    for param in &generics.params {
+                        if param.name.name().as_str() == br.name.as_str() {
+                            sp = param.span;
+                        }
+                    }
+                }
+                (format!("the lifetime {} as defined on", br.name), sp)
+            }
             ty::ReFree(ref fr) => match fr.bound_region {
                 ty::BrAnon(idx) => (
                     format!("the anonymous lifetime #{} defined on", idx + 1),
@@ -234,7 +243,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                 ),
                 _ => (
                     format!("the lifetime {} as defined on", fr.bound_region),
-                    self.sess.codemap().def_span(self.hir.span(node)),
+                    cm.def_span(self.hir.span(node)),
                 ),
             },
             _ => bug!(),

src/test/ui/borrowck/regions-bound-missing-bound-in-impl.rs

@@ -36,6 +36,7 @@ impl<'a, 't> Foo<'a, 't> for &'a isize {
 
     fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) {
         //~^ ERROR method not compatible with trait
+        //~| ERROR method not compatible with trait
         //
         // Note: This is a terrible error message. It is caused
         // because, in the trait, 'b is early bound, and in the impl,

src/test/ui/borrowck/regions-bound-missing-bound-in-impl.stderr

@@ -29,6 +29,25 @@ note: the lifetime 'c as defined on the method body at 37:5...
    |
 LL |     fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...does not necessarily outlive the lifetime 'c as defined on the method body at 37:24
+  --> $DIR/regions-bound-missing-bound-in-impl.rs:37:24
+   |
+LL |     fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) {
+   |                        ^^
+
+error[E0308]: method not compatible with trait
+  --> $DIR/regions-bound-missing-bound-in-impl.rs:37:5
+   |
+LL |     fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
+   |
+   = note: expected type `fn(&'a isize, Inv<'c>, Inv<'c>, Inv<'d>)`
+              found type `fn(&'a isize, Inv<'_>, Inv<'c>, Inv<'d>)`
+note: the lifetime 'c as defined on the method body at 37:24...
+  --> $DIR/regions-bound-missing-bound-in-impl.rs:37:24
+   |
+LL |     fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) {
+   |                        ^^
 note: ...does not necessarily outlive the lifetime 'c as defined on the method body at 37:5
   --> $DIR/regions-bound-missing-bound-in-impl.rs:37:5
    |
@@ -53,7 +72,7 @@ LL |     fn another_bound<'x: 'a>(self, x: Inv<'x>, y: Inv<'t>);
 LL |     fn another_bound<'x: 't>(self, x: Inv<'x>, y: Inv<'t>) {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `'x: 't`
 
-error: aborting due to 5 previous errors
+error: aborting due to 6 previous errors
 
 Some errors occurred: E0195, E0276, E0308.
 For more information about an error, try `rustc --explain E0195`.

src/test/ui/impl-trait/region-escape-via-bound.stderr

@@ -4,16 +4,11 @@ error[E0700]: hidden type for `impl Trait` captures lifetime that does not appea
 LL | fn foo(x: Cell<&'x u32>) -> impl Trait<'y>
    |                             ^^^^^^^^^^^^^^
    |
-note: hidden type `std::cell::Cell<&'x u32>` captures the lifetime 'x as defined on the function body at 26:1
-  --> $DIR/region-escape-via-bound.rs:26:1
+note: hidden type `std::cell::Cell<&'x u32>` captures the lifetime 'x as defined on the function body at 28:7
+  --> $DIR/region-escape-via-bound.rs:28:7
    |
-LL | / fn foo(x: Cell<&'x u32>) -> impl Trait<'y>
-LL | |     //~^ ERROR hidden type for `impl Trait` captures lifetime that does not appear in bounds [E0700]
-LL | | where 'x: 'y
-LL | | {
-LL | |     x
-LL | | }
-   | |_^
+LL | where 'x: 'y
+   |       ^^
 
 error: aborting due to previous error
 

src/test/ui/issue-46472.stderr

@@ -7,11 +7,11 @@ LL |     &mut 4
 LL | }
    | - temporary value only lives until here
    |
-note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:1...
-  --> $DIR/issue-46472.rs:13:1
+note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:8...
+  --> $DIR/issue-46472.rs:13:8
    |
 LL | fn bar<'a>() -> &'a mut u32 {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |        ^^
 
 error[E0597]: borrowed value does not live long enough (Mir)
   --> $DIR/issue-46472.rs:14:10
@@ -22,11 +22,11 @@ LL |     &mut 4
 LL | }
    | - temporary value only lives until here
    |
-note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:1...
-  --> $DIR/issue-46472.rs:13:1
+note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:8...
+  --> $DIR/issue-46472.rs:13:8
    |
 LL | fn bar<'a>() -> &'a mut u32 {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |        ^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/nll/normalization-bounds-error.stderr

@@ -4,16 +4,16 @@ error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'d` d
 LL | fn visit_seq<'d, 'a: 'd>() -> <&'a () as Visitor<'d>>::Value {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-note: first, the lifetime cannot outlive the lifetime 'd as defined on the function body at 23:1...
-  --> $DIR/normalization-bounds-error.rs:23:1
+note: first, the lifetime cannot outlive the lifetime 'd as defined on the function body at 23:14...
+  --> $DIR/normalization-bounds-error.rs:23:14
    |
 LL | fn visit_seq<'d, 'a: 'd>() -> <&'a () as Visitor<'d>>::Value {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...but the lifetime must also be valid for the lifetime 'a as defined on the function body at 23:1...
-  --> $DIR/normalization-bounds-error.rs:23:1
+   |              ^^
+note: ...but the lifetime must also be valid for the lifetime 'a as defined on the function body at 23:18...
+  --> $DIR/normalization-bounds-error.rs:23:18
    |
 LL | fn visit_seq<'d, 'a: 'd>() -> <&'a () as Visitor<'d>>::Value {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                  ^^
    = note: ...so that the types are compatible:
            expected Visitor<'d>
               found Visitor<'_>