fixed diagnostics message

Author: nilotpal-n7

compiler/rustc_parse_format/src/lib.rs

@@ -858,7 +858,9 @@ impl<'input> Parser<'input> {
             self.errors.insert(
                 0,
                 ParseError {
-                    description: "expected alignment specifier after `:` in format string; example: `{{:>?}}`".to_owned(),
+                    description:
+                        "expected alignment specifier after `:` in format string; example: `{:>?}`"
+                            .to_owned(),
                     note: None,
                     label: format!("expected `{}` to occur after `:`", alignment),
                     span: range,

tests/ui/fmt/format-alignment-hash.rs

@@ -1,5 +1,5 @@
 fn main() {
     // INVALID: alignment (`>18`) comes after `#X`, should be `:>#18X`
     println!("{0:#X>18}", 12345);
-    //~^ ERROR invalid format string: expected `>` (alignment specifier) after `:` in format string
+    //~^ ERROR invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
 }

tests/ui/fmt/format-alignment-hash.stderr

@@ -1,10 +1,8 @@
-error: invalid format string: expected `>` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+error: invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
   --> $DIR/format-alignment-hash.rs:3:20
    |
 LL |     println!("{0:#X>18}", 12345);
    |                    ^ expected `>` to occur after `:` in format string
-   |
-   = note: alignment must be one of `<` (left), `^` (center), or `>` (right)
 
 error: aborting due to 1 previous error
 

tests/ui/fmt/format-string-wrong-order.rs

@@ -13,9 +13,9 @@ fn main() {
     format!("{?:#?}", bar);
     //~^ ERROR invalid format string: expected format parameter to occur after `:`
     format!("Hello {<5:}!", "x");
-    //~^ ERROR invalid format string: expected `<` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+    //~^ ERROR invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
     format!("Hello {^5:}!", "x");
-    //~^ ERROR invalid format string: expected `^` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+    //~^ ERROR invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
     format!("Hello {>5:}!", "x");
-    //~^ ERROR invalid format string: expected `>` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+    //~^ ERROR invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
 }

tests/ui/fmt/format-string-wrong-order.stderr

@@ -50,29 +50,23 @@ LL |     format!("{?:#?}", bar);
    |
    = note: `?` comes after `:`, try `:?` instead
 
-error: invalid format string: expected `<` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+error: invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
   --> $DIR/format-string-wrong-order.rs:15:21
    |
 LL |     format!("Hello {<5:}!", "x");
    |                     ^ expected `<` to occur after `:` in format string
-   |
-   = note: alignment must be one of `<` (left), `^` (center), or `>` (right)
 
-error: invalid format string: expected `^` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+error: invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
   --> $DIR/format-string-wrong-order.rs:17:21
    |
 LL |     format!("Hello {^5:}!", "x");
    |                     ^ expected `^` to occur after `:` in format string
-   |
-   = note: alignment must be one of `<` (left), `^` (center), or `>` (right)
 
-error: invalid format string: expected `>` (alignment specifier) after `:` in format string; example: `{:>#X5}`
+error: invalid format string: expected alignment specifier after `:` in format string; example: `{:>?}`
   --> $DIR/format-string-wrong-order.rs:19:21
    |
 LL |     format!("Hello {>5:}!", "x");
    |                     ^ expected `>` to occur after `:` in format string
-   |
-   = note: alignment must be one of `<` (left), `^` (center), or `>` (right)
 
 error: aborting due to 9 previous errors