Talk about `gen fn` in diagnostics about `gen fn`

3 files changed, 5 insertions, 5 deletions

diff --git a/compiler/rustc_parse/messages.ftl b/compiler/rustc_parse/messages.ftl
index 9bedd7b8a33..9ba1f0a5df9 100644
--- a/compiler/rustc_parse/messages.ftl
+++ b/compiler/rustc_parse/messages.ftl
@@ -278,8 +278,8 @@ parse_found_expr_would_be_stmt = expected expression, found `{$token}`
 parse_function_body_equals_expr = function body cannot be `= expression;`
     .suggestion = surround the expression with `{"{"}` and `{"}"}` instead of `=` and `;`
 
-parse_gen_block = `gen` blocks are not yet implemented
-    .help = only the keyword is reserved for now
+parse_gen_fn = `gen` functions are not yet implemented
+    .help = for now you can use `gen {"{}"}` blocks and return `impl Iterator` instead
 
 parse_generic_args_in_pat_require_turbofish_syntax = generic args in patterns require the turbofish syntax
 
diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index c0e94d15da0..e5cd91a32a7 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -521,9 +521,9 @@ pub(crate) struct CatchAfterTry {
 }
 
 #[derive(Diagnostic)]
-#[diag(parse_gen_block)]
+#[diag(parse_gen_fn)]
 #[help]
-pub(crate) struct GenBlock {
+pub(crate) struct GenFn {
     #[primary_span]
     pub span: Span,
 }
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index a9f456d64cd..55ad3f42938 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -2372,7 +2372,7 @@ impl<'a> Parser<'a> {
         }
 
         if let Gen::Yes { span, .. } = genness {
-            self.sess.emit_err(errors::GenBlock { span });
+            self.sess.emit_err(errors::GenFn { span });
         }
 
         if !self.eat_keyword_case(kw::Fn, case) {