Auto merge of rust-lang#97892 - klensy:fix-spaces, r=oli-obk

diagnostics: remove trailing spaces

Remove few occurrences of trailing spaces and drive by fix of needless alloc of const string.

Author: bors

compiler/rustc_errors/src/emitter.rs

@@ -771,8 +771,12 @@ impl EmitterWriter {
         self
     }
 
-    fn maybe_anonymized(&self, line_num: usize) -> String {
-        if self.ui_testing { ANONYMIZED_LINE_NUM.to_string() } else { line_num.to_string() }
+    fn maybe_anonymized(&self, line_num: usize) -> Cow<'static, str> {
+        if self.ui_testing {
+            Cow::Borrowed(ANONYMIZED_LINE_NUM)
+        } else {
+            Cow::Owned(line_num.to_string())
+        }
     }
 
     fn draw_line(
@@ -819,7 +823,7 @@ impl EmitterWriter {
         }
         buffer.puts(line_offset, 0, &self.maybe_anonymized(line_index), Style::LineNumber);
 
-        draw_col_separator(buffer, line_offset, width_offset - 2);
+        draw_col_separator_no_space(buffer, line_offset, width_offset - 2);
     }
 
     fn render_source_line(
@@ -1929,7 +1933,7 @@ impl EmitterWriter {
             // Only show an underline in the suggestions if the suggestion is not the
             // entirety of the code being shown and the displayed code is not multiline.
             if let DisplaySuggestion::Diff | DisplaySuggestion::Underline = show_code_change {
-                draw_col_separator(&mut buffer, row_num, max_line_num_len + 1);
+                draw_col_separator_no_space(&mut buffer, row_num, max_line_num_len + 1);
                 for part in parts {
                     let span_start_pos = sm.lookup_char_pos(part.span.lo()).col_display;
                     let span_end_pos = sm.lookup_char_pos(part.span.hi()).col_display;

src/test/rustdoc-ui/intra-doc/disambiguator-mismatch.stderr

@@ -68,7 +68,7 @@ help: to link to the macro, add an exclamation mark
    |
 LL - /// Link to [derive@m]
 LL + /// Link to [m!]
-   | 
+   |
 
 error: unresolved link to `m`
   --> $DIR/disambiguator-mismatch.rs:46:14
@@ -124,7 +124,7 @@ help: to link to the constant, prefix with `const@`
    |
 LL - /// Link to [c()]
 LL + /// Link to [const@c]
-   | 
+   |
 
 error: incompatible link kind for `f`
   --> $DIR/disambiguator-mismatch.rs:72:14
@@ -136,7 +136,7 @@ help: to link to the function, add parentheses
    |
 LL - /// Link to [const@f]
 LL + /// Link to [f()]
-   | 
+   |
 
 error: unresolved link to `std`
   --> $DIR/disambiguator-mismatch.rs:77:14

src/test/rustdoc-ui/intra-doc/errors.stderr

@@ -98,7 +98,7 @@ help: to link to the associated function, add parentheses
    |
 LL - /// [type@Vec::into_iter]
 LL + /// [Vec::into_iter()]
-   | 
+   |
 
 error: unresolved link to `S`
   --> $DIR/errors.rs:68:6
@@ -110,7 +110,7 @@ help: to link to the struct, prefix with `struct@`
    |
 LL - /// [S!]
 LL + /// [struct@S]
-   | 
+   |
 
 error: unresolved link to `S::h`
   --> $DIR/errors.rs:78:6
@@ -122,7 +122,7 @@ help: to link to the associated function, add parentheses
    |
 LL - /// [type@S::h]
 LL + /// [S::h()]
-   | 
+   |
 
 error: unresolved link to `T::g`
   --> $DIR/errors.rs:86:6
@@ -134,7 +134,7 @@ help: to link to the associated function, add parentheses
    |
 LL - /// [type@T::g]
 LL + /// [T::g()]
-   | 
+   |
 
 error: unresolved link to `T::h`
   --> $DIR/errors.rs:91:6

src/test/rustdoc-ui/test-compile-fail1.stderr

@@ -3,7 +3,7 @@ error[E0428]: the name `f` is defined multiple times
   |
 6 | pub fn f() {}
   | ---------- previous definition of the value `f` here
-7 | 
+7 |
 8 | pub fn f() {}
   | ^^^^^^^^^^ `f` redefined here
   |

src/test/ui/argument-suggestions/issue-97484.stderr

@@ -16,7 +16,7 @@ help: consider removing the ``
    |
 LL -     foo(&&A, B, C, D, E, F, G);
 LL +     foo(&&A, B, C, D, E, F, G);
-   | 
+   |
 help: remove the extra arguments
    |
 LL |     foo(&&A, D, {&E}, G);

src/test/ui/asm/type-check-1.stderr

@@ -58,7 +58,7 @@ help: consider removing the borrow
    |
 LL -         asm!("{}", const &0);
 LL +         asm!("{}", const 0);
-   | 
+   |
 
 error: invalid asm output
   --> $DIR/type-check-1.rs:15:29

src/test/ui/associated-type-bounds/type-alias.stderr

@@ -9,7 +9,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere1<T> where T: Iterator<Item: Copy> = T;
 LL + type _TaWhere1<T>  = T;
-   | 
+   |
 
 warning: where clauses are not enforced in type aliases
   --> $DIR/type-alias.rs:6:25
@@ -21,7 +21,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere2<T> where T: Iterator<Item: 'static> = T;
 LL + type _TaWhere2<T>  = T;
-   | 
+   |
 
 warning: where clauses are not enforced in type aliases
   --> $DIR/type-alias.rs:7:25
@@ -33,7 +33,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere3<T> where T: Iterator<Item: 'static> = T;
 LL + type _TaWhere3<T>  = T;
-   | 
+   |
 
 warning: where clauses are not enforced in type aliases
   --> $DIR/type-alias.rs:8:25
@@ -45,7 +45,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere4<T> where T: Iterator<Item: 'static + Copy + Send> = T;
 LL + type _TaWhere4<T>  = T;
-   | 
+   |
 
 warning: where clauses are not enforced in type aliases
   --> $DIR/type-alias.rs:9:25
@@ -57,7 +57,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere5<T> where T: Iterator<Item: for<'a> Into<&'a u8>> = T;
 LL + type _TaWhere5<T>  = T;
-   | 
+   |
 
 warning: where clauses are not enforced in type aliases
   --> $DIR/type-alias.rs:10:25
@@ -69,7 +69,7 @@ help: the clause will not be checked when the type alias is used, and should be
    |
 LL - type _TaWhere6<T> where T: Iterator<Item: Iterator<Item: Copy>> = T;
 LL + type _TaWhere6<T>  = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:12:20
@@ -81,7 +81,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline1<T: Iterator<Item: Copy>> = T;
 LL + type _TaInline1<T> = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:13:20
@@ -93,7 +93,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline2<T: Iterator<Item: 'static>> = T;
 LL + type _TaInline2<T> = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:14:20
@@ -105,7 +105,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline3<T: Iterator<Item: 'static>> = T;
 LL + type _TaInline3<T> = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:15:20
@@ -117,7 +117,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline4<T: Iterator<Item: 'static + Copy + Send>> = T;
 LL + type _TaInline4<T> = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:16:20
@@ -129,7 +129,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline5<T: Iterator<Item: for<'a> Into<&'a u8>>> = T;
 LL + type _TaInline5<T> = T;
-   | 
+   |
 
 warning: bounds on generic parameters are not enforced in type aliases
   --> $DIR/type-alias.rs:17:20
@@ -141,7 +141,7 @@ help: the bound will not be checked when the type alias is used, and should be r
    |
 LL - type _TaInline6<T: Iterator<Item: Iterator<Item: Copy>>> = T;
 LL + type _TaInline6<T> = T;
-   | 
+   |
 
 warning: 12 warnings emitted
 

src/test/ui/associated-types/defaults-specialization.stderr

@@ -30,7 +30,7 @@ error[E0053]: method `make` has an incompatible type for trait
    |
 LL |     default type Ty = bool;
    |     ----------------------- expected this associated type
-LL | 
+LL |
 LL |     fn make() -> bool { true }
    |                  ^^^^
    |                  |
@@ -50,7 +50,7 @@ error[E0308]: mismatched types
    |
 LL |     type Ty = u8;
    |     ------------- associated type defaults can't be assumed inside the trait defining them
-LL | 
+LL |
 LL |     fn make() -> Self::Ty {
    |                  -------- expected `<Self as Tr>::Ty` because of return type
 LL |         0u8
@@ -77,7 +77,7 @@ error[E0308]: mismatched types
    |
 LL |     default type Ty = bool;
    |     ----------------------- expected this associated type
-LL | 
+LL |
 LL |     fn make() -> Self::Ty { true }
    |                  --------   ^^^^ expected associated type, found `bool`
    |                  |

src/test/ui/associated-types/issue-22560.stderr

@@ -5,7 +5,7 @@ LL | / trait Sub<Rhs=Self> {
 LL | |     type Output;
 LL | | }
    | |_- type parameter `Rhs` must be specified for this
-LL | 
+LL |
 LL |   type Test = dyn Add + Sub;
    |                         ^^^ help: set the type parameter to the desired type: `Sub<Rhs>`
    |

src/test/ui/associated-types/issue-36499.stderr

@@ -8,7 +8,7 @@ help: try removing the `+`
    |
 LL -     2 + +2;
 LL +     2 + 2;
-   | 
+   |
 
 error: aborting due to previous error
 

src/test/ui/async-await/issue-67765-async-diagnostic.stderr

@@ -3,7 +3,7 @@ error[E0515]: cannot return value referencing local variable `s`
    |
 LL |     let b = &s[..];
    |              - `s` is borrowed here
-LL | 
+LL |
 LL |     Err(b)?;
    |     ^^^^^^^ returns a value referencing data owned by the current function
 

src/test/ui/async-await/issue-70594.stderr

@@ -31,7 +31,7 @@ help: remove the `.await`
    |
 LL -     [1; ().await];
 LL +     [1; ()];
-   | 
+   |
 
 error: aborting due to 4 previous errors
 

src/test/ui/async-await/issues/issue-54752-async-block.stderr

@@ -9,7 +9,7 @@ help: remove these parentheses
    |
 LL - fn main() { let _a = (async { }); }
 LL + fn main() { let _a = async { }; }
-   | 
+   |
 
 warning: 1 warning emitted
 

src/test/ui/async-await/issues/issue-62009-1.stderr

@@ -37,7 +37,7 @@ help: remove the `.await`
    |
 LL -     (|_| 2333).await;
 LL +     (|_| 2333);
-   | 
+   |
 
 error: aborting due to 4 previous errors
 

src/test/ui/async-await/unnecessary-await.stderr

@@ -13,7 +13,7 @@ help: remove the `.await`
    |
 LL -     boo().await;
 LL +     boo();
-   | 
+   |
 help: alternatively, consider making `fn boo` asynchronous
    |
 LL | async fn boo() {}

src/test/ui/blind/blind-item-item-shadow.stderr

@@ -3,7 +3,7 @@ error[E0255]: the name `foo` is defined multiple times
    |
 LL | mod foo { pub mod foo {  } }
    | ------- previous definition of the module `foo` here
-LL | 
+LL |
 LL | use foo::foo;
    |     ^^^^^^^^ `foo` reimported here
    |

src/test/ui/block-result/issue-5500.stderr

@@ -12,7 +12,7 @@ help: consider removing the borrow
    |
 LL -     &panic!()
 LL +     panic!()
-   | 
+   |
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrow-raw-address-of-borrowed.stderr

@@ -3,10 +3,10 @@ error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immuta
    |
 LL |     let y = &x;
    |             -- immutable borrow occurs here
-LL | 
+LL |
 LL |     let q = &raw mut x;
    |             ^^^^^^^^^^ mutable borrow occurs here
-LL | 
+LL |
 LL |     drop(y);
    |          - immutable borrow later used here
 
@@ -15,7 +15,7 @@ error[E0502]: cannot borrow `x` as immutable because it is also borrowed as muta
    |
 LL |     let y = &mut x;
    |             ------ mutable borrow occurs here
-LL | 
+LL |
 LL |     let p = &raw const x;
    |             ^^^^^^^^^^^^ immutable borrow occurs here
 ...
@@ -30,7 +30,7 @@ LL |     let y = &mut x;
 ...
 LL |     let q = &raw mut x;
    |             ^^^^^^^^^^ second mutable borrow occurs here
-LL | 
+LL |
 LL |     drop(y);
    |          - first borrow later used here
 

src/test/ui/borrowck/borrow-raw-address-of-deref-mutability.stderr

@@ -3,7 +3,7 @@ error[E0596]: cannot borrow `*x` as mutable, as it is behind a `&` reference
    |
 LL |     let x = &0;
    |             -- help: consider changing this to be a mutable reference: `&mut 0`
-LL | 
+LL |
 LL |     let q = &raw mut *x;
    |             ^^^^^^^^^^^ `x` is a `&` reference, so the data it refers to cannot be borrowed as mutable
 
@@ -12,7 +12,7 @@ error[E0596]: cannot borrow `*x` as mutable, as it is behind a `*const` pointer
    |
 LL |     let x = &0 as *const i32;
    |             -- help: consider changing this to be a mutable pointer: `&mut 0`
-LL | 
+LL |
 LL |     let q = &raw mut *x;
    |             ^^^^^^^^^^^ `x` is a `*const` pointer, so the data it refers to cannot be borrowed as mutable
 

src/test/ui/borrowck/borrow-tuple-fields.stderr

@@ -5,7 +5,7 @@ LL |     let r = &x.0;
    |             ---- borrow of `x.0` occurs here
 LL |     let y = x;
    |             ^ move out of `x` occurs here
-LL | 
+LL |
 LL |     r.use_ref();
    |     ----------- borrow later used here