maybe

src/test/ui/fmt/ifmt-bad-arg.stderr

@@ -170,7 +170,7 @@ LL |     format!("foo %s baz", "bar");
    |                  |
    |                  help: format specifiers use curly braces: `{}`
    |
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 
 error: invalid format string: expected `'}'`, found `'t'`
   --> $DIR/ifmt-bad-arg.rs:75:1

src/test/ui/fmt/issue-89173.rs

@@ -10,5 +10,5 @@ fn main() {
     //~| NOTE: argument never used
     //~| NOTE: argument never used
     //~| NOTE: format specifiers use curly braces, and you have to use a positional or named parameter for the width
-    //~| NOTE: printf formatting not supported
+    //~| NOTE: printf formatting is not supported
 }

src/test/ui/fmt/issue-89173.stderr

@@ -12,7 +12,7 @@ note: format specifiers use curly braces, and you have to use a positional or na
    |
 LL |     print!("%0*x", width, num);
    |             ^^^^
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 
 error: aborting due to previous error
 

src/test/ui/macros/format-foreign.stderr

@@ -8,7 +8,7 @@ LL |     println!("%.*3$s %s!\n", "Hello,", "World", 4);
    |              |               argument never used
    |              multiple missing formatting specifiers
    |
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 help: format specifiers use curly braces
    |
 LL |     println!("{:.2$} {}!\n", "Hello,", "World", 4);
@@ -22,7 +22,7 @@ LL |     println!("%1$*2$.*3$f", 123.456);
    |               |
    |               help: format specifiers use curly braces: `{0:1$.2$}`
    |
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 
 error: multiple unused formatting arguments
   --> $DIR/format-foreign.rs:6:7
@@ -37,7 +37,7 @@ LL | | "###, "Hello,", "World", 4);
    | |____|  argument never used
    |      multiple missing formatting specifiers
    |
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 help: format specifiers use curly braces
    |
 LL ~     println!(r###"{:.2$}
@@ -60,7 +60,7 @@ LL |     println!("Hi there, $NAME.", NAME="Tim");
    |                         |
    |                         help: format specifiers use curly braces: `{NAME}`
    |
-   = note: shell formatting not supported; see the documentation for `std::fmt`
+   = note: shell formatting is not supported; see the documentation for `std::fmt`
 
 error: multiple unused formatting arguments
   --> $DIR/format-foreign.rs:15:32
@@ -72,7 +72,7 @@ LL |     println!("$1 $0 $$ $NAME", 1, 2, NAME=3);
    |              |                 argument never used
    |              multiple missing formatting specifiers
    |
-   = note: shell formatting not supported; see the documentation for `std::fmt`
+   = note: shell formatting is not supported; see the documentation for `std::fmt`
 help: format specifiers use curly braces
    |
 LL |     println!("{1} {0} $$ {NAME}", 1, 2, NAME=3);

src/test/ui/macros/format-unused-lables.stderr

@@ -44,7 +44,7 @@ LL |        "things"
 LL |              , UNUSED="args");
    |                       ^^^^^^ named argument never used
    |
-   = note: shell formatting not supported; see the documentation for `std::fmt`
+   = note: shell formatting is not supported; see the documentation for `std::fmt`
 
 error: aborting due to 4 previous errors
 

src/test/ui/macros/issue-92267.stderr

@@ -10,7 +10,7 @@ note: format specifiers use curly braces, and the conversion specifier `
    |
 LL | pub fn main() { println!("🦀%%%", 0) }
    |                               ^^
-   = note: printf formatting not supported; see the documentation for `std::fmt`
+   = note: printf formatting is not supported; see the documentation for `std::fmt`
 
 error: aborting due to previous error