tweak error message

Author: lcnr

src/librustc_typeck/lib.rs

@@ -285,9 +285,9 @@ fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: LocalDefId) {
                             tcx.sess,
                             span,
                             E0752,
-                            "start is not allowed to be `async`"
+                            "`start` is not allowed to be `async`"
                         )
-                        .span_label(span, "start is not allowed to be `async`")
+                        .span_label(span, "`start` is not allowed to be `async`")
                         .emit();
                         error = true;
                     }
@@ -297,11 +297,11 @@ fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: LocalDefId) {
                             tcx.sess
                                 .struct_span_err(
                                     attr.span,
-                                    "start is not allowed to be `#[track_caller]`",
+                                    "`start` is not allowed to be `#[track_caller]`",
                                 )
                                 .span_label(
                                     start_span,
-                                    "start is not allowed to be `#[track_caller]`",
+                                    "`start` is not allowed to be `#[track_caller]`",
                                 )
                                 .emit();
                             error = true;

src/test/ui/async-await/issue-68523-start.rs

@@ -4,6 +4,6 @@
 
 #[start]
 pub async fn start(_: isize, _: *const *const u8) -> isize {
-//~^ ERROR start is not allowed to be `async`
+//~^ ERROR `start` is not allowed to be `async`
     0
 }

src/test/ui/async-await/issue-68523-start.stderr

@@ -1,8 +1,8 @@
-error[E0752]: start is not allowed to be `async`
+error[E0752]: `start` is not allowed to be `async`
   --> $DIR/issue-68523-start.rs:6:1
    |
 LL | pub async fn start(_: isize, _: *const *const u8) -> isize {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ start is not allowed to be `async`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `start` is not allowed to be `async`
 
 error: aborting due to previous error
 

src/test/ui/rfc-2091-track-caller/error-with-start.rs

@@ -1,7 +1,7 @@
 #![feature(start)]
 
 #[start]
-#[track_caller] //~ ERROR start is not allowed to be `#[track_caller]`
+#[track_caller] //~ ERROR `start` is not allowed to be `#[track_caller]`
 fn start(_argc: isize, _argv: *const *const u8) -> isize {
     panic!("{}: oh no", std::panic::Location::caller());
 }

src/test/ui/rfc-2091-track-caller/error-with-start.stderr

@@ -1,12 +1,12 @@
-error: start is not allowed to be `#[track_caller]`
+error: `start` is not allowed to be `#[track_caller]`
   --> $DIR/error-with-start.rs:4:1
    |
 LL |   #[track_caller]
    |   ^^^^^^^^^^^^^^^
 LL | / fn start(_argc: isize, _argv: *const *const u8) -> isize {
 LL | |     panic!("{}: oh no", std::panic::Location::caller());
 LL | | }
-   | |_- start is not allowed to be `#[track_caller]`
+   | |_- `start` is not allowed to be `#[track_caller]`
 
 error: aborting due to previous error