rustc: print ExistentialProjection with spaces around =, e.g. dyn Foo<A = X>.

Author: eddyb

src/librustc/ty/print/pretty.rs

@@ -1489,7 +1489,7 @@ define_print_and_forward_display! {
 
     ty::ExistentialProjection<'tcx> {
         let name = cx.tcx().associated_item(self.item_def_id).ident;
-        p!(write("{}=", name), print(self.ty))
+        p!(write("{} = ", name), print(self.ty))
     }
 
     ty::ExistentialPredicate<'tcx> {

src/test/ui/associated-types/associated-types-eq-3.stderr

@@ -29,7 +29,7 @@ LL |     baz(&a);
    |
    = note: expected type `usize`
               found type `Bar`
-   = note: required for the cast to the object type `dyn Foo<A=Bar>`
+   = note: required for the cast to the object type `dyn Foo<A = Bar>`
 
 error: aborting due to 3 previous errors
 

src/test/ui/associated-types/associated-types-overridden-binding-2.stderr

@@ -6,7 +6,7 @@ LL |     let _: &I32Iterator<Item = u32> = &vec![42].into_iter();
    |
    = note: expected type `u32`
               found type `i32`
-   = note: required for the cast to the object type `dyn I32Iterator<Item=u32, Item=i32>`
+   = note: required for the cast to the object type `dyn I32Iterator<Item = u32, Item = i32>`
 
 error: aborting due to previous error
 

src/test/ui/confuse-field-and-method/issue-2392.stderr

@@ -75,7 +75,7 @@ LL |     w.wrap.not_closure();
    |
    = help: did you mean to write `w.wrap.not_closure` instead of `w.wrap.not_closure(...)`?
 
-error[E0599]: no method named `closure` found for type `Obj<std::boxed::Box<(dyn std::boxed::FnBox<(), Output=u32> + 'static)>>` in the current scope
+error[E0599]: no method named `closure` found for type `Obj<std::boxed::Box<(dyn std::boxed::FnBox<(), Output = u32> + 'static)>>` in the current scope
   --> $DIR/issue-2392.rs:62:24
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {

src/test/ui/issues/issue-20605.stderr

@@ -1,10 +1,10 @@
-error[E0277]: the size for values of type `dyn std::iter::Iterator<Item=&mut u8>` cannot be known at compilation time
+error[E0277]: the size for values of type `dyn std::iter::Iterator<Item = &mut u8>` cannot be known at compilation time
   --> $DIR/issue-20605.rs:2:17
    |
 LL |     for item in *things { *item = 0 }
    |                 ^^^^^^^ doesn't have a size known at compile-time
    |
-   = help: the trait `std::marker::Sized` is not implemented for `dyn std::iter::Iterator<Item=&mut u8>`
+   = help: the trait `std::marker::Sized` is not implemented for `dyn std::iter::Iterator<Item = &mut u8>`
    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
    = note: required by `std::iter::IntoIterator::into_iter`
 

src/test/ui/issues/issue-22312.stderr

@@ -1,4 +1,4 @@
-error[E0605]: non-primitive cast: `Self` as `&dyn std::ops::Index<usize, Output=<Self as std::ops::Index<usize>>::Output>`
+error[E0605]: non-primitive cast: `Self` as `&dyn std::ops::Index<usize, Output = <Self as std::ops::Index<usize>>::Output>`
   --> $DIR/issue-22312.rs:11:24
    |
 LL |         let indexer = &(*self as &Index<usize, Output = <Self as Index<usize>>::Output>);

src/test/ui/issues/issue-55796.stderr

@@ -16,8 +16,8 @@ LL |         Box::new(self.out_edges(u).map(|e| e.target()))
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: but, the lifetime must be valid for the static lifetime...
    = note: ...so that the expression is assignable:
-           expected std::boxed::Box<(dyn std::iter::Iterator<Item=<Self as Graph<'a>>::Node> + 'static)>
-              found std::boxed::Box<dyn std::iter::Iterator<Item=<Self as Graph<'a>>::Node>>
+           expected std::boxed::Box<(dyn std::iter::Iterator<Item = <Self as Graph<'a>>::Node> + 'static)>
+              found std::boxed::Box<dyn std::iter::Iterator<Item = <Self as Graph<'a>>::Node>>
 
 error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
   --> $DIR/issue-55796.rs:21:9
@@ -37,8 +37,8 @@ LL |         Box::new(self.in_edges(u).map(|e| e.target()))
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: but, the lifetime must be valid for the static lifetime...
    = note: ...so that the expression is assignable:
-           expected std::boxed::Box<(dyn std::iter::Iterator<Item=<Self as Graph<'a>>::Node> + 'static)>
-              found std::boxed::Box<dyn std::iter::Iterator<Item=<Self as Graph<'a>>::Node>>
+           expected std::boxed::Box<(dyn std::iter::Iterator<Item = <Self as Graph<'a>>::Node> + 'static)>
+              found std::boxed::Box<dyn std::iter::Iterator<Item = <Self as Graph<'a>>::Node>>
 
 error: aborting due to 2 previous errors
 

src/test/ui/retslot-cast.stderr

@@ -2,10 +2,10 @@ error[E0308]: mismatched types
   --> $DIR/retslot-cast.rs:13:5
    |
 LL |     inner(x)
-   |     ^^^^^^^^ expected trait `std::iter::Iterator<Item=()>`, found trait `std::iter::Iterator<Item=()> + std::marker::Send`
+   |     ^^^^^^^^ expected trait `std::iter::Iterator<Item = ()>`, found trait `std::iter::Iterator<Item = ()> + std::marker::Send`
    |
-   = note: expected type `std::option::Option<&dyn std::iter::Iterator<Item=()>>`
-              found type `std::option::Option<&dyn std::iter::Iterator<Item=()> + std::marker::Send>`
+   = note: expected type `std::option::Option<&dyn std::iter::Iterator<Item = ()>>`
+              found type `std::option::Option<&dyn std::iter::Iterator<Item = ()> + std::marker::Send>`
 
 error: aborting due to previous error
 

src/test/ui/typeck/issue-57673-ice-on-deref-of-boxed-trait.stderr

@@ -7,7 +7,7 @@ LL |     *x
    |     ^^ expected (), found trait std::iter::Iterator
    |
    = note: expected type `()`
-              found type `(dyn std::iter::Iterator<Item=()> + 'static)`
+              found type `(dyn std::iter::Iterator<Item = ()> + 'static)`
 
 error: aborting due to previous error
 

src/test/ui/unboxed-closures/unboxed-closure-sugar-default.stderr

@@ -1,8 +1,8 @@
-error[E0277]: the trait bound `dyn Foo<(isize,), isize, Output=()>: Eq<dyn Foo<(isize,), Output=()>>` is not satisfied
+error[E0277]: the trait bound `dyn Foo<(isize,), isize, Output = ()>: Eq<dyn Foo<(isize,), Output = ()>>` is not satisfied
   --> $DIR/unboxed-closure-sugar-default.rs:21:5
    |
 LL |     eq::< Foo<(isize,),isize,Output=()>,      Foo(isize)                      >();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Eq<dyn Foo<(isize,), Output=()>>` is not implemented for `dyn Foo<(isize,), isize, Output=()>`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Eq<dyn Foo<(isize,), Output = ()>>` is not implemented for `dyn Foo<(isize,), isize, Output = ()>`
    |
 note: required by `eq`
   --> $DIR/unboxed-closure-sugar-default.rs:14:1