add note

Author: HTGAzureX1212

compiler/rustc_lint/messages.ftl

@@ -242,20 +242,36 @@ lint_identifier_non_ascii_char = identifier contains non-ASCII characters
 
 lint_identifier_uncommon_codepoints = identifier contains {$codepoints_len ->
     [one] { $identifier_type ->
-        [Exclusion] an {$identifier_type} Unicode codepoint
-        [Technical] a {$identifier_type} Unicode codepoint
-        [Limited_Use] a {$identifier_type} Unicode codepoint
-        [Not_NFKC] a {$identifier_type} Unicode codepoint
+        [Exclusion] a Unicode codepoint that is no longer used
+        [Technical] a Unicode codepoint that has specialized usage
+        [Limited_Use] a Unicode codepoint that is in limited use
+        [Not_NFKC] a Unicode codepoint that is not used in normalized strings
         *[other] an uncommon Unicode codepoint
     }
     *[other] { $identifier_type ->
-        [Exclusion] {$identifier_type} Unicode codepoints
-        [Technical] {$identifier_type} Unicode codepoints
-        [Limited_Use] {$identifier_type} Unicode codepoints
-        [Not_NFKC] {$identifier_type} Unicode codepoints
+        [Exclusion] {$codepoints_len} Unicode codepoints that are no longer used
+        [Technical] {$codepoints_len} Unicode codepoints that have specialized usage
+        [Limited_Use] {$codepoints_len} Unicode codepoints that are in limited use
+        [Not_NFKC] {$codepoints_len} Unicode codepoints that are not used in normalized strings
         *[other] uncommon Unicode codepoints
     }
 }: {$codepoints}
+    .note = {$codepoints_len ->
+        [one] { $identifier_type ->
+            [Exclusion] this character is included in the {$identifier_type} Unicode general security profile
+            [Technical] this character is included in the {$identifier_type} Unicode general security profile
+            [Limited_Use] this character is included in the {$identifier_type} Unicode general security profile
+            [Not_NFKC] this character is included in the {$identifier_type} Unicode general security profile
+            *[other] this Unicode codepoint is uncommon
+        }
+        *[other] { $identifier_type ->
+            [Exclusion] these characters are included in the {$identifier_type} Unicode general security profile
+            [Technical] these characters are included in the {$identifier_type} Unicode general security profile
+            [Limited_Use] these characters are included in the {$identifier_type} Unicode general security profile
+            [Not_NFKC] these characters are included in the {$identifier_type} Unicode general security profile
+            *[other] these Unicode codepoints are uncommon
+        }
+    }
 
 lint_ignored_unless_crate_specified = {$level}({$name}) is ignored unless specified at crate level
 

compiler/rustc_lint/src/lints.rs

@@ -1086,6 +1086,7 @@ pub struct IdentifierNonAsciiChar;
 
 #[derive(LintDiagnostic)]
 #[diag(lint_identifier_uncommon_codepoints)]
+#[note]
 pub struct IdentifierUncommonCodepoints {
     pub codepoints: Vec<char>,
     pub codepoints_len: usize,

tests/ui/lexer/lex-emoji-identifiers.stderr

@@ -46,6 +46,7 @@ warning: identifier contains an uncommon Unicode codepoint: '\u{fe0f}'
 LL |     let key1️⃣ = "keycap sequence";
    |         ^^^^
    |
+   = note: this Unicode codepoint is uncommon
    = note: `#[warn(uncommon_codepoints)]` on by default
 
 error: aborting due to 7 previous errors; 1 warning emitted

tests/ui/lint/rfc-2457-non-ascii-idents/lint-uncommon-codepoints.rs

@@ -1,10 +1,10 @@
 #![deny(uncommon_codepoints)]
 
-const µ: f64 = 0.000001; //~ ERROR identifier contains a Not_NFKC Unicode codepoint: 'µ'
+const µ: f64 = 0.000001; //~ identifier contains a Unicode codepoint that is not used in normalized strings: 'µ'
 //~| WARNING should have an upper case name
 
 fn dijkstra() {}
-//~^ ERROR identifier contains a Not_NFKC Unicode codepoint: 'ij'
+//~^ ERROR identifier contains a Unicode codepoint that is not used in normalized strings: 'ij'
 
 fn main() {
     let ㇻㇲㇳ = "rust"; //~ ERROR identifier contains uncommon Unicode codepoints

tests/ui/lint/rfc-2457-non-ascii-idents/lint-uncommon-codepoints.stderr

@@ -1,26 +1,31 @@
-error: identifier contains a Not_NFKC Unicode codepoint: 'µ'
+error: identifier contains a Unicode codepoint that is not used in normalized strings: 'µ'
   --> $DIR/lint-uncommon-codepoints.rs:3:7
    |
 LL | const µ: f64 = 0.000001;
    |       ^
    |
+   = note: this character is included in the Not_NFKC Unicode general security profile
 note: the lint level is defined here
   --> $DIR/lint-uncommon-codepoints.rs:1:9
    |
 LL | #![deny(uncommon_codepoints)]
    |         ^^^^^^^^^^^^^^^^^^^
 
-error: identifier contains a Not_NFKC Unicode codepoint: 'ij'
+error: identifier contains a Unicode codepoint that is not used in normalized strings: 'ij'
   --> $DIR/lint-uncommon-codepoints.rs:6:4
    |
 LL | fn dijkstra() {}
    |    ^^^^^^^
+   |
+   = note: this character is included in the Not_NFKC Unicode general security profile
 
 error: identifier contains uncommon Unicode codepoints: 'ㇻ', 'ㇲ', and 'ㇳ'
   --> $DIR/lint-uncommon-codepoints.rs:10:9
    |
 LL |     let ㇻㇲㇳ = "rust";
    |         ^^^^^^
+   |
+   = note: these Unicode codepoints are uncommon
 
 warning: constant `µ` should have an upper case name
   --> $DIR/lint-uncommon-codepoints.rs:3:7