review comment: plural of emoji is emoji

compiler/rustc_interface/src/passes.rs

@@ -455,7 +455,7 @@ pub fn configure_and_expand(
         for (ident, spans) in identifiers.drain() {
             sess.diagnostic().span_err(
                 MultiSpan::from(spans),
-                &format!("identifiers cannot contain emojis: `{}`", ident),
+                &format!("identifiers cannot contain emoji: `{}`", ident),
             );
         }
     });

compiler/rustc_parse/src/lexer/mod.rs

@@ -224,7 +224,7 @@ impl<'a> StringReader<'a> {
                 token::Ident(sym, is_raw_ident)
             }
             rustc_lexer::TokenKind::InvalidIdent
-                // Do not recover an identifier with emojis if the codepoint is a confusable
+                // Do not recover an identifier with emoji if the codepoint is a confusable
                 // with a recoverable substitution token, like `➖`.
                 if UNICODE_ARRAY
                     .iter()

compiler/rustc_session/src/parse.rs

@@ -123,7 +123,7 @@ pub struct ParseSess {
     /// clashing with keywords in new editions.
     pub raw_identifier_spans: Lock<Vec<Span>>,
     /// Places where identifiers that contain invalid Unicode codepoints but that look like they
-    /// should be. Useful to avoid bad tokenization when encountering emojis. We group them to
+    /// should be. Useful to avoid bad tokenization when encountering emoji. We group them to
     /// provide a single error per unique incorrect identifier.
     pub bad_unicode_identifiers: Lock<FxHashMap<Symbol, Vec<Span>>>,
     source_map: Lrc<SourceMap>,

src/test/ui/parser/emoji-identifiers.rs

@@ -1,16 +1,16 @@
-struct ABig👩‍👩‍👧‍👧Family; //~ ERROR identifiers cannot contain emojis
-struct 👀; //~ ERROR identifiers cannot contain emojis
+struct ABig👩‍👩‍👧‍👧Family; //~ ERROR identifiers cannot contain emoji
+struct 👀; //~ ERROR identifiers cannot contain emoji
 impl 👀 {
-    fn full_of_✨() -> 👀 { //~ ERROR identifiers cannot contain emojis
+    fn full_of_✨() -> 👀 { //~ ERROR identifiers cannot contain emoji
         👀
     }
 }
-fn i_like_to_😅_a_lot() -> 👀 { //~ ERROR identifiers cannot contain emojis
+fn i_like_to_😅_a_lot() -> 👀 { //~ ERROR identifiers cannot contain emoji
     👀::full_of✨() //~ ERROR no function or associated item named `full_of✨` found for struct `👀`
-    //~^ ERROR identifiers cannot contain emojis
+    //~^ ERROR identifiers cannot contain emoji
 }
 fn main() {
     let _ = i_like_to_😄_a_lot() ➖ 4; //~ ERROR cannot find function `i_like_to_😄_a_lot` in this scope
-    //~^ ERROR identifiers cannot contain emojis
+    //~^ ERROR identifiers cannot contain emoji
     //~| ERROR unknown start of token: \u{2796}
 }

src/test/ui/parser/emoji-identifiers.stderr

@@ -18,25 +18,25 @@ LL | fn i_like_to_😅_a_lot() -> 👀 {
 LL |     let _ = i_like_to_😄_a_lot() ➖ 4;
    |             ^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `i_like_to_😅_a_lot`
 
-error: identifiers cannot contain emojis: `i_like_to_😄_a_lot`
+error: identifiers cannot contain emoji: `i_like_to_😄_a_lot`
   --> $DIR/emoji-identifiers.rs:13:13
    |
 LL |     let _ = i_like_to_😄_a_lot() ➖ 4;
    |             ^^^^^^^^^^^^^^^^^^
 
-error: identifiers cannot contain emojis: `full_of_✨`
+error: identifiers cannot contain emoji: `full_of_✨`
   --> $DIR/emoji-identifiers.rs:4:8
    |
 LL |     fn full_of_✨() -> 👀 {
    |        ^^^^^^^^^^
 
-error: identifiers cannot contain emojis: `full_of✨`
+error: identifiers cannot contain emoji: `full_of✨`
   --> $DIR/emoji-identifiers.rs:9:8
    |
 LL |     👀::full_of✨()
    |         ^^^^^^^^^
 
-error: identifiers cannot contain emojis: `👀`
+error: identifiers cannot contain emoji: `👀`
   --> $DIR/emoji-identifiers.rs:2:8
    |
 LL | struct 👀;
@@ -53,13 +53,13 @@ LL | fn i_like_to_😅_a_lot() -> 👀 {
 LL |     👀::full_of✨()
    |     ^^
 
-error: identifiers cannot contain emojis: `i_like_to_😅_a_lot`
+error: identifiers cannot contain emoji: `i_like_to_😅_a_lot`
   --> $DIR/emoji-identifiers.rs:8:4
    |
 LL | fn i_like_to_😅_a_lot() -> 👀 {
    |    ^^^^^^^^^^^^^^^^^^
 
-error: identifiers cannot contain emojis: `ABig👩👩👧👧Family`
+error: identifiers cannot contain emoji: `ABig👩👩👧👧Family`
   --> $DIR/emoji-identifiers.rs:1:8
    |
 LL | struct ABig👩👩👧👧Family;